Create and sell events

is it possible allow create event for any expert in addition of appointments? it could be very useful because expert make money doing appointments but also offering pay events.

If by events you mean listings with a single date and the ability to pay for it, then it may be possible if you restrict Bookings to other categories in HivePress/Settings/Bookings, and for the event category you can add a custom Date attribute that will display the event date. You can also enable quantity in HivePress/Settings/Listings/Selling to allow sellers to limit the number of places that can be purchased for an event.