Tickets can have the option to be available to the user by other means

[lchircop]

The requirement that the date is required for a ticket to go on sale is tedious. It would be nice to have sales for the first category of tickets if these tickets are fixed, and once these tickets are sold, the next section is automatically opened.

Also, having this would not require to have a certain timespan when the tickets go live. We can remove this completely and have these parameters instead and the tickets are live as long as the event is live, making the date optional