Don't start slingin' streamers and poppin' corks; you're not out of the woods quite yet. While completion of your goal is on the horizon, make sure to double check, fact check, and then triple check that every detail is complete and all of your ducks are in a row. The last thing you want to do is start the celebration early, only to have to go back and fix problems later on.
It's better to be safe than sorry, so ensure you are certain you can warrant a celebration before you actually start it; it'll save you from doing double (or triple!) work in the end!