Steve proposes to Eddie waaay before marriage equality comes to the USA, and (despite being a contrarian anarchist fully against the status quo) Eddie immediately says yes, because duh. It's Stevie.

They have the ceremony surrounded with family and friends, cut the cake, do the first dance, the whole shebang, and when asked, Eddie's completely fine with it being somewhat traditional as it's 'his illegal wedding to his unlawful husband'.