How to be Prettier: Wear heels for nice legs. Sometimes I wear flip flops to the party, carrying my heels, and then ditch the flip flops in my bag before I go in. If it is a super special occasion, and my clutch won't fit the flip flops, I get really cheap sandals from the dollar store and just toss them before walking into the party.
How to be (less) Awkward: Learn all the lyrics to three standard party songs. Options listed here. Then bust them out casually at a social gathering--this is actually more impressive than one might think.