Two women moved from one side of Camden’s Town Green to the other as rain moved in, stayed for a few minutes and then left only to be replaced by a hot sun. Paddy Bell and Helen Crolley did so Wednesday for four hours, taking the first watch, so to speak, in a campaign to get people to sign another petition concerning the city’s proposed sports complex. “We tried to think of things where people are coming and going,” Crolley said.