Comcast toppers Ralph J. Roberts and Brian L. Roberts will receive the Steven J. Ross Humanitarian Award from the UJA Federation of New York.Honor is handed out each year to a leader “whose spirit of generosity and kindness is both boundless and selfless.” Ralph Roberts is cabler’s chair of the executive and finance committee. Brian Roberts is Comcast’s prexy and CEO. Evening, to be hosted by Jon Stewart, will take place May 20 at the Waldorf Astoria. Patti LaBelle will perform. Rubert Murdoch, Sumner Redstone, Richard Parsons and Harvey Weinstein will all chair the gala.