Getting rowdy is perfectly acceptable, if not encouraged - even though one would assume this would be a uptight bunch when going to a horse-related event. A perfect example:
Step 1: Hold the Svedka bottle upside down and get on your buddy's shoulders when he's not paying attention.
Step 2: Pull it together and act like it was all planned. Then triumphantly look over the other puny day drinkers like you are their king.