Los eventos se crean con un slug. Ejecutar migraciones al traer este commit por primera vez.

app/Http/Controllers/EventoController.php

@@ -48,6 +48,7 @@ class EventoController extends Controller
         ]);
         $evento = new Evento();
         $evento->nombre = $request->input("nombre");
+        $evento->setSlug();
         $evento->save();
         return redirect()->route("edit", ['evento' => $evento]);
     }

app/Models/Evento.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Str;
 
 class Evento extends Model
 {
@@ -54,4 +55,15 @@ class Evento extends Model
         }
         return ($dur_a > $dur_b) ? -1 : 1;
     }
+
+    //Llamado liego de la validación. Asume un nombre válido.
+    public function setSlug()
+    {
+        $baseSlug = Str::slug($this->nombre);
+        $this->slug = $baseSlug;
+        $i = 1;
+        while (self::whereSlug($this->slug)->exists()){
+            $this->slug = $baseSlug . "-" . $i++;
+        }
+    }
 }

database/migrations/2021_12_28_205423_evento_slug.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class EventoSlug extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('eventos', function (Blueprint $table) {
+            $table->string('slug')->unique();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('eventos', function (Blueprint $table) {
+            $table->dropColumn('slug');
+        });
+    }
+}