php artisan make:event UserRegistered
php artisan make:listener SendWelcomeEmail --event=UserRegistered

// app/Providers/EventServiceProvider.php
protected $listen = [
    UserRegistered::class => [
        SendWelcomeEmail::class,
    ],
];

class UserRegistered implements ShouldBroadcast
{
    public $user;

    public function __construct(User $user)
    {
        $this->user = $user;
    }
}

class SendWelcomeEmail
{
    public function handle(UserRegistered $event)
    {
        Mail::to($event->user->email)->send(new WelcomeMail($event->user));
    }
}

use App\Events\UserRegistered;

event(new UserRegistered($user));