Cameron Crowe‘s The Union, a doc about how Elton John nursed and goaded Leon Russell out of obscurity and back to recording and performing, will open the Tribeca Film Festival on 4.20. John will perform live after the free outdoor screening. Is it worth it to spend $400 or $500 bills to fly back, not to mention lodging, food and cat-sitting costs, so I can catch this and the festival (which runs from 4.20 through 5.1) en masse? I fear not.