I really want to enjoy my night out but I feel myself beginning to get triggers and I don’t want to give in and begin to ruminate. Ugh.

Unfortunately “trying” to enjoy your night is going to cause you to want to avoid triggers, which in effect will not allow you to enjoy your night. Instead stop trying to enjoy your night. Just do the thing you said you would do, and accept the uncertainty of what comes may come. If you get triggered so be it. It doesn’t matter. Just accept what will be, and I guarantee you, you will start “enjoying” your nights