I'm not answering for CardPuncher.... I don't know why that club set out a curtain, but I do know why I laid out fabric behind chickens the last 3 years I ran matches back in the day. To help keep the matches moving the fabric I used cut down the time it took to find AND recover the little ones.
I got twenty bucks says his club had the same reason. OH WAIT.... I forgot that twenty bucks is no longer worth spit.