The Denver City Council is on the verge of referring a question to the November ballot that would ask Denver voters if city workers should have the right to unionize and collectively bargain with city management. But on Monday the council focused on passing a handful of amendments to the ballot question that were designed in part to ensure the support of the city’s top boss: Mayor Mike Johnston. With those changes to the ballot language now in place — five different amendments passed unanimously on Monday — supporters including City Councilwoman Sarah Parady are already looking forward to this fall. “We’re going to pass it tonight, the voters need to pass it in November,” Parady said at a raucous pro-union rally held in front of the City and County Building on Monday afternoon. Parady was jumping ahead a bit.