But organizers said the event was still a success.
"We're disappointed, but it's still heartening to see how many people stayed despite the rain," Benko said.
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Protesters jumped on a 14-foot trampoline, on loan from the Dudley Co-op, drank hot chocolate and munched on carrots and cookies.
At one point, after organizers set up a sound system, strobe light, and invited a disc jockey to spin tunes, the demonstration attracted about 80 people.
Activists said they planned to go ahead with plans to greet Rudenstine and other administrators as they arrived in the morning.