Video from Denver on Saturday night shows a large crowd led by attorney Gloria Allred protesting outside.
More than 15 women have claimed the comedian drugged and raped them.
Cosby has a sold out show Sunday night in Turlock, in the Central Valley.
And while there isn't strong opposition to him doing his standup routine there, some people are selling their tickets, saying he shouldn't be on stage right now at all.
"Tough call," said resident Sue Garton. "My gut instinct is that he should probably lay low until it all comes about and it's all over."
Turlock theater management says if someone wants to get rid of their tickets, they'll help find buyers.
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