New Year's Eve is meant to be a time of celebration and fun, but with celebration and fun comes alcohol and large crowds. While people are out having a good time, police are standing by.
Arrests on New Year's Eve can be justified and unjustified. Sometimes, cops get frustrated with large alcohol-fueled crowds and may just start arresting people for stumbling or making too much noise. Those arrests are usually charged as disorderly intoxication, or disorderly conduct - both misdemeanors.
South Beach, Las Olas, and City Place (West Palm Beach) are three very popular (and populated) hang-outs on New Year's Eve. Arrests in those locations are not uncommon.