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It was a wedding of Deadhead proportions.

Grateful Dead founding member Bob Weir officiated the nuptials of longtime friend and real estate investor William “Billy” Procida backstage before Saturday’s Dead & Company show at Citi Field.

“Seventeen years ago I jumped on stage and did an encore with [Weir] and we became great friends,” Procida told Page Six on Monday, adding he’s been in with the band ever since.

The ceremony took place in a “VIP room” where the legendary rocker “came in and said a poem and the ‘I do’s,'” another attendee recalled, adding, “He said beautiful things.”

Procida called the ceremony “beautiful and funny,” explaining that “at the end, [we] forgot to sign the marriage license. He was getting on a golf cart to go on stage and I had to chase him!”

The bride, Kelly Lauerman, wore a long white dress and turquoise pumps and held a tie-dyed bouquet of flowers.

While the ceremony only lasted about 15 minutes, Weir took the time afterward to take pictures and chat with the 50 or 60 people in attendance.

When asked if band member John Mayer was present for the nuptials, the attendee said he “was not there at all,” but Procida notes that keyboardist Jeff Chimenti was and stood beside him during the vows.

Immediately following, the happy couple and around 2,000 of their closest friends and family took up an entire section of the stadium for the show.

It’s not the first time Weir has lent his hand to the institution of backstage marriage. Last October, he did the same for Live Nation regional president Geoff Gordon at a show in Pennsylvania.