"I think it's politics," Lasry said.
About 50 people were expected at Lasry's home for the $40,000-per-ticket reception. Tickets to a 500-person gala at the Waldorf-Astoria began at $2,500. Those who contribute $35,800 or raise $100,000 get access to a smaller reception with Obama.
The concert at the New Amsterdam Theater was expected to draw 1,700 people. Tickets for that event started at $250, the Obama campaign said.
Three winners of an online ticket contest will attend both the gala and concert and were expected to meet the current and former presidents.
While Obama was in New York, Romney was on the West Coast to attend fundraisers in Portland, Ore., and Seattle.
Monday night was not the first joint fundraising appearance by Obama and Clinton. The two appeared together and addressed supporters in late April at the Virginia home of Clinton adviser Terry McAuliffe.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.