Doping Cyclist: Dress up in full pro kit. Use a marker to draw needle tracks up and down one arm. Tie a length of surgical tubing above one elbow and leave a syringe sticking out of your vein. Wheel around an IV tower for the duration of the party. Stuff your jersey pockets with bottles of Drugs. When anyone asks what / who you are, respond that you are a professional cyclist. When they ask what all the needles and Drugs are for, say you have no idea what they're talking about. No matter what, do not admit you have any drugs -related items on hand.
Mountain Biker (If You're normally a Roadie): Prepare for the party by gaining 10Kg and getting 20-30 tattoos. Wear baggy pants -- baggy enough that they keep falling down. Arrive drunk at the party and continue to drink once you get there. Insist you have mad skillz.
Roadie (If You're normally a Mountain Biker): Prepare for the party by putting a stick in your butt. Wear uncomfortably tight cycling clothes for the party, drink nothing put thrice-filtered water and tell everyone exactly how many calories and fat everything they're eating contains.
Triathlete: Don't come to the party, because you've only done four workouts today and still need to get in one more and you don't want to break training, no matter what.
Recumbent Rider: Tape your glasses together, somehow manage to affix a pocket protector to your jersey, and loudly and insistently explain to all and sundry that recumbents are really much more comfortable and practical than "wedge" bikes. Talk a lot about prostates.
Recreational Cyclist: Wear street clothes with your right pant leg cuff completely greasy and shredded. Wear a bike helmet backwards and cocked to one side. Tell people that you're starting to bike again to get back in shape.
Commuter: Wear street clothes, but carry a backpack or messenger bag full of what are clearly stinky bike clothes the entire evening. Make your helmet hair extremely obvious. Keep looking for opportunities to casually introduce the fact that you are a bike commuter into every single conversation in which you participate.
Fixie / Track Cyclist: Dress the same as a road cyclist, but you must always either keep walking or -- if you must stay in one place -- you must trackstand by moving a couple inches forward, then back, then forward and back again.
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The Force is strong in this one...
The Force is strong in this one...