diff --git a/errors/errors.go b/errors/errors.go
index 584aae79..c9f12026 100644
--- a/errors/errors.go
+++ b/errors/errors.go
@@ -6,7 +6,20 @@ import (
 	"git.andreafazzi.eu/andrea/oef/i18n"
 )
 
+type Error struct {
+	TemplateName string
+	Err          error
+}
+
+func (e *Error) Error() string {
+	return e.Err.Error()
+}
+
 var (
-	RecordExists  = errors.New("Record already exists!")
-	NotAuthorized = errors.New(i18n.Authorization["notAuthorized"]["it"])
+	RecordExists   = errors.New("Record already exists!")
+	NotAuthorized  = errors.New(i18n.Authorization["notAuthorized"]["it"])
+	CategoryExists = &Error{
+		TemplateName: "error_category_exists",
+		Err:          errors.New(i18n.FlashMessages["categoryExists"]["it"]),
+	}
 )
diff --git a/i18n/i18n.go b/i18n/i18n.go
index ef0b1606..05a08166 100644
--- a/i18n/i18n.go
+++ b/i18n/i18n.go
@@ -8,6 +8,9 @@ var (
 		"schoolExists": map[string]string{
 			"it": "Una scuola con questo codice meccanografico è già presente nella base dati!",
 		},
+		"categoryExists": map[string]string{
+			"it": "Un partecipante della stessa categoria è già stato iscritto dalla scuola.",
+		},
 		"notAuthorized": map[string]string{
 			"it": "L'utente non dispone delle autorizzazioni necessarie a visualizzare questa pagina.",
 		},
diff --git a/main.go b/main.go
index 9cb4eaa8..a375ee21 100644
--- a/main.go
+++ b/main.go
@@ -34,6 +34,7 @@ var (
 		&orm.Response{},
 		&orm.User{},
 		&orm.Category{},
+		&orm.Region{},
 	}
 )
 
@@ -74,6 +75,9 @@ func main() {
 	log.Println("Eventually write categories on DB...")
 	orm.CreateCategories()
 
+	log.Println("Eventually write regions on DB...")
+	orm.CreateRegions()
+
 	log.Println("Map models <-> handlers")
 	if err := orm.MapHandlers(models); err != nil {
 		panic(err)
diff --git a/orm/participant.go b/orm/participant.go
index 38ea04f7..9272cea8 100644
--- a/orm/participant.go
+++ b/orm/participant.go
@@ -149,6 +149,7 @@ func (model *Participant) Create(args map[string]string, w http.ResponseWriter,
 			return nil, err
 		}
 
+		// Check if participant exists
 		if user, err := participant.exists(); err == nil && user != nil {
 			if err := DB().Where("user_id = ?", user.ID).Find(&participant).Error; err != nil {
 				return nil, err
@@ -162,8 +163,7 @@ func (model *Participant) Create(args map[string]string, w http.ResponseWriter,
 			return nil, err
 		}
 
-		participant.UserModifierCreate = NewUserModifierCreate(r)
-
+		// If user has "school" role get school id from token
 		if isSchool(r) {
 			schoolID, err := strconv.Atoi(getUserIDFromToken(r))
 			if err != nil {
@@ -171,6 +171,22 @@ func (model *Participant) Create(args map[string]string, w http.ResponseWriter,
 			}
 			participant.SchoolID = uint(schoolID)
 		}
+
+		// Check if a participant of the same category exists
+		var school School
+		if err := DB().First(&school, participant.SchoolID).Error; err != nil {
+			return nil, err
+		}
+		hasCategory, err := school.HasCategory(participant)
+		if err != nil {
+			return nil, err
+		}
+		if hasCategory {
+			return nil, errors.CategoryExists
+		}
+
+		participant.UserModifierCreate = NewUserModifierCreate(r)
+
 		participant, err = CreateParticipant(participant)
 		if err != nil {
 			return nil, err
@@ -284,6 +300,19 @@ func (model *Participant) Update(args map[string]string, w http.ResponseWriter,
 			return nil, err
 		}
 
+		// Check if a participant of the same category exists
+		var school School
+		if err := DB().First(&school, participant.(*Participant).SchoolID).Error; err != nil {
+			return nil, err
+		}
+		hasCategory, err := school.HasCategory(participant.(*Participant))
+		if err != nil {
+			return nil, err
+		}
+		if hasCategory {
+			return nil, errors.CategoryExists
+		}
+
 		if err := DB().Where(participant.(*Participant).ContestIDs).Find(&participant.(*Participant).Contests).Error; err != nil {
 			return nil, err
 		}
diff --git a/orm/school.go b/orm/school.go
index 30f0ffe9..bc018392 100644
--- a/orm/school.go
+++ b/orm/school.go
@@ -2,6 +2,7 @@ package orm
 
 import (
 	"fmt"
+	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -248,3 +249,12 @@ func SaveSchool(school interface{}) (interface{}, error) {
 	}
 	return school, nil
 }
+
+func (model *School) HasCategory(participant *Participant) (bool, error) {
+	var participants []*Participant
+	log.Println(model)
+	if err := DB().Where("category_id = ? AND school_id = ? AND id <> ?", participant.CategoryID, model.ID, participant.ID).Find(&participants).Error; err != nil {
+		return false, err
+	}
+	return len(participants) > 0, nil
+}
diff --git a/renderer/renderer.go b/renderer/renderer.go
index d570097b..105f970d 100644
--- a/renderer/renderer.go
+++ b/renderer/renderer.go
@@ -9,6 +9,7 @@ import (
 	"log"
 
 	"git.andreafazzi.eu/andrea/oef/config"
+	"git.andreafazzi.eu/andrea/oef/errors"
 	"github.com/gorilla/sessions"
 	"mime"
 	"net/http"
@@ -228,12 +229,23 @@ func Use(r Renderer) {
 }
 
 func (rend *HTMLRenderer) writeError(w http.ResponseWriter, r *http.Request, data interface{}) {
-	t, ok := rend.templates["error"]
-	if !ok {
-		panic(fmt.Errorf("Error template not found! Can't proceed, sorry."))
-	}
+	var t *template.Template
 
-	log.Println(data.(*htmlTemplateData).Data.(error))
+	err, ok := data.(*htmlTemplateData).Data.(*errors.Error)
+	if ok {
+		t, ok = rend.templates[err.TemplateName]
+		if !ok {
+			panic(fmt.Errorf("Error template not found! Can't proceed, sorry."))
+		}
+
+	} else {
+
+		t, ok = rend.templates["error"]
+		if !ok {
+			panic(fmt.Errorf("Error template not found! Can't proceed, sorry."))
+		}
+		log.Println(data.(*htmlTemplateData).Data.(error))
+	}
 
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	e := t.ExecuteTemplate(w, "base", data)
diff --git a/templates/error_category_exists.html.tpl b/templates/error_category_exists.html.tpl
new file mode 100644
index 00000000..81cc52af
--- /dev/null
+++ b/templates/error_category_exists.html.tpl
@@ -0,0 +1,11 @@
+{{ define "content" }}
+<div class="container">
+  <h1 class="border-bottom">Errore</h1>
+  <p>
+    Si è verificato un errore durante la creazione o l'aggiornamento di un partecipante: <strong>{{.Data}}</strong>
+  </p>
+  <p>
+    Clicca {{all "Participant"|anchor "qui"}} per tornare all'elenco dei partecipanti.
+  </p>
+</div>
+{{ end }}
diff --git a/templates/participants.html.tpl b/templates/participants.html.tpl
index 93880b06..3cd62a11 100644
--- a/templates/participants.html.tpl
+++ b/templates/participants.html.tpl
@@ -45,7 +45,8 @@
     {{end}}
 
   </div>
-  
+
+  {{if $isSchool}}
   {{if eq (len .Data) 2}}
   <div class="row">
     <div class="col-md-12">
@@ -55,6 +56,7 @@
     </div>
   </div>
   {{end}}
+  {{end}}
   
 </div>
 
diff --git a/templates/participants_show.html.tpl b/templates/participants_show.html.tpl
index 939ff3a8..5abd9253 100644
--- a/templates/participants_show.html.tpl
+++ b/templates/participants_show.html.tpl
@@ -15,6 +15,8 @@
     <dd class="col-sm-9">{{.Data.User.Username}}</dd>
     <dt class="col-sm-3">Password</dt>
     <dd class="col-sm-9">{{.Data.User.Password}}</dd>
+    <dt class="col-sm-3">Categoria</dt>
+    <dd class="col-sm-9">{{.Data.Category}}</dd>
     {{if $creatorUser:=.Data.CreatedBy}}
     <dt class="col-sm-3">Creato da</dt>
     <dd class="col-sm-9">{{$creatorUser.Username}}[{{$creatorUser.Role}}] {{$.Data.CreatedAt|prettyDateTime}}</dd>
@@ -45,6 +47,7 @@
     </div>
   </div>
 
+  {{if $isAdmin}}
   <div class="row">
     <div class="col-md-12">
       
@@ -60,7 +63,6 @@
     </div>
   </div>
 
-  {{if $isAdmin}}
   <div class="row">
     <div class="col-md-12">
 
diff --git a/templates/schools_add_update.html.tpl b/templates/schools_add_update.html.tpl
index d7619f9b..2551a554 100644
--- a/templates/schools_add_update.html.tpl
+++ b/templates/schools_add_update.html.tpl
@@ -63,7 +63,19 @@
   {{end}}
 
   {{template "input" dict "options" ($codeOptions|yaml) "value" (.Data|field "Code") "update" $update}}
-  
+
+  {{$options := ` { name: "Address",id: "school_address",label: "Indirizzo dell'istituto",placeholder: "Inserire via, numero civico e città",type: "text",required: "true"} `}}
+  {{template "input" dict "options" ($options|yaml) "value" (.Data|field "Address") "update" $update}}
+
+  {{$options := `
+  name: "region_id"
+  id: "region_id"
+  label: "Regione"
+  title: "Seleziona la regione"
+  required: "true"
+  `}}
+  {{template "select" dict "options" ($options|yaml) "data" (.Data|field "AllRegions") "selected" (.Data|field "SelectedRegion") "update" $update "form" $form}}
+
   {{$options := ` { name: "Email",id: "school_email",label: "Indirizzo email",placeholder: "Inserire l'indirizzo di posta istituzionale",type: "email",required: "true"} `}}
   {{template "input" dict "options" ($options|yaml) "value" (.Data|field "Email") "update" $update}}
 
diff --git a/templates/schools_show.html.tpl b/templates/schools_show.html.tpl
index 698e3d93..694a7d89 100644
--- a/templates/schools_show.html.tpl
+++ b/templates/schools_show.html.tpl
@@ -41,6 +41,10 @@
     <dd class="col-sm-9">{{.Data.Name}}</dd>
     <dt class="col-sm-3">Codice meccanografico</dt>
     <dd class="col-sm-9">{{.Data.Code}}</dd>
+    <dt class="col-sm-3">Indirizzo</dt>
+    <dd class="col-sm-9">{{.Data.Address}}</dd>
+    <dt class="col-sm-3">Regione</dt>
+    <dd class="col-sm-9">{{.Data.Region}}</dd>
     <dt class="col-sm-3">Email</dt>
     <dd class="col-sm-9">{{.Data.Email}}</dd>
     {{if .Data.EmailSentDate}}