Replying to Emergency

So heres the story, we've been spending alot of time with our families last three days so really no time to exchange gifts (me and my gf) So today my GF calls me up and asks me to come to some Armenian Christmas disco (i'm polish thats why i didn't want to go in the first place) but i had nothing better to do so i thought why not. While i'm there dancing/drinking doing whatever i ask her what she got for christmas (at this point we still havent exchnaged gifts, we're suppose to do it tmrw over dinner) she tells me some stuff and then her mom got her a two tickets to Dirty Dancing (for her and her mom), AND THE PROBLEM is i ogt her the same lol.... two tickets.... i told her this there and she felt really bad for me, i felt bummed because it's not a surprise no more.... i guess her mom can go with her dad and then we can go togethor as my rents have already seen it.... but the part i'm most pissed about is its not a surprise anymore, i just wanted to see the look on her face thats it... so here i sit... i invited her over for dinner today in about 15 hours from now... what should i do... or should i just leave it.....

i was thinking i can always go out and buy something else but..... thats kinda...