Liza Minnelli didn’t even have to show up at the Drama League gala to steal the show. This was no small feat considering Thursday’s lineup included Joel Grey, Nick Jonas, Cheyenne Jackson and honoree Kristin Chenoweth. A private dinner with Minnelli at SD26 was on the silent auction block and fetched a plucked eyebrow-raising $16,500 — the highest bid in the organization’s history. Liza’s big-spending dining companion’s identity is being kept secret.