I realize this might not be your goal, but any chance you would consider targeting some features toward academics? Academic conferences are horrible to keep track of, and this seems like it might almost be a great solution.

The missing pieces, as I see them, include more structured programs (i.e., the sessions have titles; the speakers are listed even if they're not on Lanyrd or even Twitter) and the ability to follow series of conferences (i.e., I want to know what happens at OOPSLA every year, not just once).