Housekeepers and other hotel employees took the stage on Day 1 of the AFL-CIO’s Pride at Work convention and told delegates that the Millennium Hotel had pulled back tentative agreements with their union two months after booking the convention. Delegates didn’t take the news sitting down. They marched out of the Millennium ballroom and into the lobby, with hotel staff in the lead, and held a lively rally in their defense. When security guards demanded demonstrators move to the sidewalk outside, they refused, holding the lobby for nearly a half hour. The action marked a spirited start to the three-day convention that began Aug.