You should really try not to take any unnecessary risks where your finances are concerned right now. But if you insist on spending money a little more freely than usual, just realize that it's bound to end up leading to a few serious disagreements between you and your partner before the end of the day.
You'd undoubtedly rather have a good time than have to spend too much time worrying about anything else right now. Just be careful that you're not tempted into spending too much money enjoying yourself tonight. And if you do end up getting into a few disputes over finances, it could lead you to realize that you and someone you care about have some very different views on things. Mantra: I will create foundations that I can build on.