I have never attended an REI class, but locally most of the lbs that sell major brand bike, have a once a month seminar... most of them are around 6 or 7 in the evening and last about an hour... topic is listed in advance each month...the trek dealer, as an incentive, gives a 10% discount on all maintenance products that evening to all class attendees. So check with you other lbs in the area and see if they do something similar. From you said in your post, I would definitely go to this class, and follow up by checking with other lbs offers in your area.