Hmm... an hour's drive. Well it also depends on the location. While most Apple Stores are the same, some have theatres which allow for large group workshops.
Admittedly, most Apple Stores don't have workshops like that. The majority of the time, you walk in, tell them you're interested in the workshop scheduled for today, and they'll find someone to help you out for an hour. Not too many customers know about the workshops, except in the big Apple Stores like the ones I mentioned earlier. Truthfully, all their workshops are actually very good, and you can learn a LOT from them. It really just depends on how busy it is, and how many people might join you for the same workshop.
It my experience though, the workshops I've attended were always one-on-one. Just go in and ask about it, and they'll find someone to help.