Get in line now.
Union Square Hospitality Group’s Shake Shack is giving away hamburgers (ShackBurger or Lockhart Link Burger, you choose) and t-shirts to the first 50 customers on May 5 to celebrate its birthday. There’s also gonna be a special birthday cake concrete available for guests, but who cares. It’s all about that free meat. May as well cue up now, cause that event is gonna be stupid crowded.