Robin De Jesús also joins the company of the long-running hit musical.
Williams won the Project Runway Wicked Challenge on November 13.
Roscioli will replace fellow Wicked alum Teal Wicks.
Items dedicated to the likes of Barbra Streisand, Robin Williams, and Joan Rivers also helped the charity rake in the dough.
The cabaret will play Broadway night spot 54 Below.
Stephen Trask, Julia Murney, and Euan Morton talk about the surprising second careers they love.
Hosted by Glee's Jane Lynch, the benefit concert served to support the UN's Free & Equal campaign.