Comedian Amy Schumer (below left), who had two sold-out shows at the Wilbur Theatre on Saturday, hung backstage with Wilbur owner Bill Blumenreich and hisfiancé, Sherri West. . . . Yo-Yo Ma and his wife, Jill Horner, brought their family to see this year’s Irish-themed Christmas Revels on Saturday afternoon. . . . Former Patriots quarterback Steve Grogan attended Saturday’s “Taste of the NFL” cooking class at Davio’s in the Back Bay. Davio’s corporate chef Rodney Murillo and executive chef Steve Brown served as instructors. Davio’s owner Steve DiFillippo donated proceeds from the class to the Greater Boston Food Bank.