Aw, babe. It's fine, it's all good. They're kids, it was Vegas, sometimes one thing just leads to another! And she's gonna introduce you to him, right? So you can meet him and make sure he's not some kind of opera house-haunting gremlin. (That's a joke, just to be clear! I am 150% confident Lyra didn't marry the Phantom of the Opera, everything is fine.)
Okay, so no extravagant gifts, got it. How about a couple comp tickets for Farcical? Meal and a show? And, I dunno, I just googled "practical wedding presents" and all the results are either boring as ass or, like... this.