Great idea but Why the exclusivity bit.
Only open to 40 people in total so hardly going to get them tills ringing. The kids are off all week open it up a bit more.
Perhaps to do with a manageable amount of people who the tour guides can take round and narrate to. Speaking from experience (not the Attis) 10-12 is often a decent limit. There may already be 2-3 groups to take round in one evening.
