Last I went, there was a door cover, and the group lesson was simply available if you arrived early enough before the music.
I believe dancing lessons are like $5 for guys and free for ladies on Wed and $9 on Fridays. You can confirm on their website http://aztecwillies.com/events/
Dance lessons are free...and fun. They teach you several different dances step by step with each step building on the previous. Then the dancing starts. A really great time.
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