Conversation so far:
when was Stan Brakhage born?
January 14, 1933.
where was he born?
Born Robert Sanders in Kansas City, Missouri on January 14, 1933, Brakhage was adopted and renamed three weeks after his birth.
who were his parents?
Ludwig and Clara Brakhage.
did he end up having any siblings?
CANNOTANSWER.
where did he go to school?
He was raised in Denver, Colorado, where he attended high school with the filmmaker Larry Jordan and the musicians Morton Subotnick and James Tenney.
did he go to college?
Brakhage briefly attended Dartmouth College on a scholarship before dropping out to make films.
did he collaborate with Jordan, Subotnick and Tenney?
Together, Brakhage, Jordan, Tenney and Subotnick formed a drama group called the Gadflies.

Question: what did that drama group perform (or do?)?
Self-contained rewrite: what did Gadflies perform (or do?)