It works well for mixed age groups precisely because nobody has an advantage, your mother and your sister's twenty five year old friends are all equally bad at it on the first go. That tends to break the ice faster than drinks do. Most studios treat bachelorette bookings as a standard event type. A pottery making class in Toronto at Pottery Studio 1 fits eight comfortably and you can bring food and drinks in with no corkage. Everyone takes home a piece afterwards, which is a better souvenir than a novelty sash. Confirm the timing when you book, two hours plus setup can eat into a dinner reservation faster than you expect.