Subjects like this always draw a lot of comment and debate. I know Maxville, Ontario is very big. I haven't been yet but hope to soon. Some events are very large but strictly speaking straddle that line between a Scottish event and a "Celtic" event; Bethlehem, PA comes to mind with an attendance that approaches 250,000, but their Clan group is very small and I'm not sure they even have highland athletics. To me, every one of the games has it's own aura - but speaking strictly from a personal point of view it is very hard to beat Loon Mountain, NH; Grandfather Mountain, and Long's Peak Colorado for the spectacular settings up in their own "highlands".