Well, Coastermania is usually the day when most of us are there. I went there last year, and I saw some people wearing GTTP shirts during the AM ERT pass by me, but I never asked them who they were on this site. Many people go on opening day and closing day too, but I think that Coastermania is the best bet, especially since many of us would be in the same spot in the morning (MF and Raptor).