How long can I book an event before the beginning?

I think there is an application deadline. How many hours before it is?

You can sign up for an event any time before it starts. However, if nobody has signed up for an Event 24 hours before it starts, it will be cancelled. You may not cancel your attendance at an Event less than 24 hours ahead of time. You also may not create an Event less than 24 hours ahead of time.

I only thought, that the tutor need a special time to see my joining , thanks Mark.

A tutor may cancel an event if they look at it in advance and nobody has signed up. However, if they do not cancel it, people can sign up whenever they want. They don’t have to sign up 24 hours in advance. This applies to all posted events, not to events that members create. Please see Mark’s answer about for details about events that members create.