app/Models/Category.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Str;

class Category extends Model
{
    protected $fillable = ['name', 'slug'];

    protected static function booted(): void
    {
        static::creating(function (Category $cat) {
            if (empty($cat->slug)) {
                $cat->slug = Str::slug($cat->name);
            }
        });
    }

    // ── Relationships ────────────────────────────────────

    public function events()
    {
        return $this->hasMany(Event::class);
    }
}