How about the pre-season game with Theo Fleury returning- scoring in the shootout to win it?
Not sure that really applies to your question [EDIT: Definitely doesn't as that wasn't even his first preseason game that year!] , but that was the most electric the Dome has EVER been for an exhibition game- and probably the most fun since the games during the '04 run.
https://www.youtube.com/watch?v=8nGGt8vCdpA
Others include Baertschi's first game, Johnny Hockey's first game last year, Jokinen's 1st (the 1st time), Connroy's return, and a great memory during the dark times was the surprise of Fast Freddy Brathwaite! He was really fun to cheer for in those days.