The last full weekend of June, from the Wednesday to the Monday.

First you have to register, then pray to the ticket gods in early October when they go on sale. There's also a resale the following April.

It varies year-to-year. Generally late March to early April for the first full announcement. Rumours and one-off announcements start much sooner.

You can find a list below.

Yes, and it can be consumed anywhere in the festival.