RAT CONFERENCE RAT Conference $5.00 a conversation   Theatre Double   1619 Walnut Street Web Site:   www.ratconference.com This confederacy of independent theaters and unaffiliated artists from around the country collaborate outside the mainstream through various resource exchanges in an effort to create a workable model for a new national theater. FRI 9/1 Late Night, After · SAT 9/2 Late Night, After · FRI 9/8 Late Night, After SAT 9/9 Late Night, After · FRI 9/15 Late Night, After · SAT 9/16 Late Night, After