Previously the arena only listed ticketed events, but private events--like a graduation or a memorial service--can impact neighbors and/or prove useful to merchants. Note that, along with NYU Poly and Long Island University, which are repeats, Yeshiva University, CUNY City Tech, and CUNY Baruch are holding graduation events.
Several weeks at the end of April and early May are not booked. Presumably they must be kept open because the Brooklyn Nets may get into (and advance in) the NBA playoffs. The Nets have been on a surge, and as of last night, they're in the 8th seed.