I know this threads really old, but I came across it googling for life drawing classes. so maybe someone else will find it and it'll help.
There's a bunch in cbus wild goose creative on summit has a couple a month. WGC only charges like $7 to sketch. You're gonna get less instrution obviously but its still great practice. Columbus College of Art and Design (CCAD) has saturday morning classes usually their classes are like $100 or so but that'll cover materials (sketch pad included) and the class goes for a couple saturdays. Ummmmm The cultural arts center on main st. has classes. theirs are like 50 - 70 bucks and it goes a couple days but they're usually during the day on work days so it's hard to get to if you're working a day job and that's about it. i'm sure there's classes in the sub cities like dublin, upper arlington or reynoldsburg that have classes in their community centers.
Hope this helps anyone looking for Life drawing classes in Columbus, Ohio!