Not trying to start a war here, but here are some facts that I observe happening in Singapore:
Canon's sponsored events are open to everyone. For example, The Car's the Star, Canon Photo Marathon, etc.
Nikon's sponsored events are exclusive for Nikon SLR users only. For example, Maxim bikini contest and the Big Walk.
I'm a Canon DSLR users, and quite dissapointed of not being able to participate in Nikon's events.