Cheap venue?

So I'd like to host like a mini-workshop for about say 60 people (paid event).

However, I am having some trouble finding a good and cheap facility as I'd like to have a few work stations there to demonstrate what I'm talking about. I have the equipment already so I'm not really concerned about the facility having this already.

So far from my own research I've found the following possibilities which hopefully will help some of you out who may want to do this in the future:

Churches
Dance studios
Party halls
Training centers
Non-profit organization's meeting rooms
General meeting rooms
Building's party rooms

From the list above, I've found a couple of decent possibilities but since the area I plan to target is highly populated, it's not that cheap and the ones which were cheap were unavailable for my target dates. Anyone know of any other types of venues that might be able to accommodate this that I might be missing? As maybe I might have better luck with a different venue type...

I would definitely try your local college or university. I'm on a university campus and we make use of the classrooms and meeting rooms here all the time, and they generally cost us nothing.

The student union building is a great place to start as student unions generally rent out their spots to clubs and whatnot for a very low price.

Or an Internet cafe...

Just ask the owners if you can be there for free if you share your revenue

Ah I forgot to mention universities, only issue with them is that I've found that several only lease to student organizations and for non-students, it's pretty pricey (your results will vary of course depending on what school it is).

As for Internet Cafe, good suggestion as I don't think their hourly earnings are that high that they would charge too much.

Try really big restaurants on off nights, or really big cafes.

Actually, if you're in a highly populated area, one place you should definitely check out is co-working spaces. Often time's they have meeting spaces or even spaces large enough for small seminars. And they'll give you the space for free, because they want to get the word out about the co-working space. In San Francisco for example, there's a space called "The Hub" that often has speakers come in and speak to members for free.