Here in Ottawa, most times, you have to bring your own gear with you. Some places provide a PA, some provide you with a soundman and a PA, some others they provide nothing but a stage. So in order for a band to do gigs here, you will need to have pretty much everything from PA, mics, drum kits, amplifiers, lights etc. I used to bring my Fender Twin to all the gigs/practices until I got tired of lugging it all over the place. For one thing its gotten really beat up so I thought I'd invest on a smaller amp that I can gig with and not break my back carrying around. So now I've been using a Peavey Classic 30.
The only time they usually provide everything is when there are multiple bands playing like for instance during "battle of the bands" kinda thing.
But for me, even if they provide amps, I always use my own. Just a comfort thing I suppose.