A discussion on “The Intersection of Bikes and Business” is part of a kickoff event for May’s National Bike Month on Sunday. The 1 to 5:30 p.m. gathering is expected to include U.S. Rep. Ayanna Pressley and state Sen. Will Brownsberger. It’s a hot topic, considering a policy order returns Monday to Cambridge’s City Council asking for an extension of the timeline installing bike lanes.