Lupita Nyong’o, Jessica Simpson, Julianna Margulies, Kristen Bell, Robin Wright, Julia Louis-Dreyfus, Tony Goldwyn, casts of “Veep,” “Scandal,” and “House Cards” — the annual White House Correspondents’ Association dinner celebrated its 100th anniversary this weekend. I was lucky enough to do some freelance work for US Weekly during the festivities (because when there’s 15 parties…