I am going to do a rollerblading course this weekend, if anyone wants to come along let my know as I'll book through my gym.
NB: tip for the guys, I go to a women-only gym, so if you want to see loads of girls flying around in spandex (apart from me of course) it's a good course to do!
There are courses on Saturday and Sunday afternoon, split between beginners and "experts". Saturday is 2 hours, Sunday just 1. You don't have to do both days, they're separate.