I just got invited to a masquerade ball party for this New Year and I only have 2 days to prepare! Please help! How can I find the right dress and how can I make sure I don't end up awkward in the party.

This answer is a bit late but you can still use it in your next costume party

Get a simple theme that everyone can use. Although this type of party is often associated with Victorian theme, coming in with a formal attire and a good mask is also acceptable.

Invest in masks - when the guests arrive, offer them masks if they did not bring one. The object of this party is to mingle without revealing too much

Aside from the masks and great costume, add some mystery to the party by hiring tarot readers that will give those interested a reading about their fortune or future.