The key answer of exercise 2

a)

Because the events are unusual or 'alternative' and different from the normal events in this type of events page.

c)

The museum meditation in the afternoon and the playback theatre in the evening.

d)

1. silent disco → You choose the music and listen to it on headphones.
2. blind date cinema → you buy a ticket but you don't know the film.
3. improv playback theatre → People in the audience tell a story (about their lives) and the actors act it out.
4. museum meditation → You meditate in a museum room, then you look at the exhibits and talk about them.