I never saw an arrival show so i don't know how to judge if it's a good or a bad thing but it was nice with 18 and 19 that all of the backstory was already given to you before you went to the event. The other problem with arrival seems that not everyone may be able to see it for multiple reasons, so explaining everything in one show may not be a good idea. Unless they do multiple shows almost like the Skoolhouse bus thing but that is a bit different than summoning Fear.