Nichols died on November 19.
Tepper's book series explores the history of Broadway's many theaters.
The event honored director Michael Mayer and publicist Rick Miramontez.
Leakes will be the final Wicked Stepmother in the current Broadway production.
Nick Payne's two-character drama plays Manhattan Theatre Club's Samuel J. Friedman Theatre.
Erin Davie and Emily Padgett star in the Henry Krieger-Bill Russell musical revival.
The legendary performer was remembered during a memorial at the Al Hirschfeld Theatre.
Jackman leads the cast of Jez Butterworth's new drama alongside Cush Jumbo and Laura Donnelly.
Williams won the Project Runway Wicked Challenge on November 13.