Bill Cosby's concert venue,Compulsory gun Check.

Bill Cosby has reason to worry about his
security ... so much so one of the venues where
he was scheduled to perform imposed a
mandatory gun check on the audience.The
Tarrytown Music Hall in N.Y. was preparing for a
Cosby concert this Saturday, the prep included a
significant weapons security check, which
includes: -- Metal detector wands at the
door          -- No firearms, knives or other
weapons -- No backpacksThe theater also
made it clear ... there would be zero tolerance
for any protests inside the venue.The Exec
Director of the theater tells TMZ the extra
security measures were not routine ... they were
rolled out for Cosby's show.Turns out the show
will not go on. It was abruptly cancelled
Wednesday, at the behest of Cosby and the
promoter.