Card game at the drum circle

I was sitting in a large circle with a group of people.  The circle was not really a circle but more of an L shaped circle.  People on the other side were sitting on a wall so were a little bit higher than me.  We were all playing cards.  I had an excellent hand of four aces and some other card.  I opened a beer.  Somebody on the other side of the circle said we could not drink beer there.  I asked them what kind of circle this was and they said a drum circle.  I also asked when it was decided we could not drink beer and the person told me that themselves and one other person had decided last night to make that rule.