The vera gallery is all volunteer run. Depending on what you're interested in learning what to do they're always interested in help. I think knowing what you want to get from the experience is key. Do you want to deal with the art handling and hanging or are you more interested in the selling of work? If the latter they wouldn't be good since they are not sales oriented if the business side of it is what you want you should target for profit galleries but if you want to learn how to do cards and work with poster designers then they would still be a good choice.

What is your background? Do you make work yourself (if so it's a great eye opener) I know that the call for new work went out recently so if you were interested in the process of going through applications and deciding a years worth of shows it would be an excellent opportunity since you wouldn't have that kind of experience at most galleries and it's fun to look through all the images and try to group together artists that normally wouldn't show together.
If you have an interest in non profits theyre a good choice too since you would get a bit of exposure to working within budgets and possibly grant writing (a terrific skill to learn if you're interested in working in the arts long term.) some of the skillls you learn for free there could land you paying work elsewhere in the future if it clicks with you.

The vera project aside I think figuring out what you want from the experience is key and then going to galleries where you consistently like the work they show is key.