Differences between Canadian and American audiences:

It is not easy to get Canadians to sing along, though if you shame them into it, they will readily clap along. There are exceptions of course... east coasters in particular like to have a good time. Also all Canadians seem have a particular affinity for fiddle jigs & reels. It's one of the few instances where they will let themselves "go" in public (other than at a rave or hockey game). In concerts they almost seem to consider it impolite to join in.

Americans, on the other hand, will quite readily sing along, yell along, clap along, stopm along. etc. with little or no prompting
(this is true both in bar and concert settings). It really gets you pumped up to play and sing.

Canadians are in general lousy tippers. Americans tip well and often; it almost seems a matter of pride with them. Of course, your average bar staff in the States is less well paid than in Canada. Canada has a higher minimum wage for them.

In an American bar/pub, things will get quite loud, whereas Canadian places are quieter. I'm not talking about the music being played; I am talking about the patrons. Best friends will usually stand inches apart and yell into each others faces at the top of their lungs for hours. In a similar situation in a Canadian bar, it means a punch will be thrown before you can count to 10.

It kind of pains me to say it, but in a lot of ways, I prefer American audiences; more participation, more tips (better pay for the gigs too, usually), more reasonable requests and enthusiasm/gratitude for your doing them... I've also never had to fend off a dangerous drunk in the States (they seem to take less offence to being kidded).