You should be careful while choosing the type of party you intend to attend. Going to a regular couples party will decrease your chances of finding a person because of the presence of too many couples. However, you should consider going to a party that is for singles only as this will increase your chances to meet someone suitable.
Remember that your dressing depicts your personality. Therefore, you should be careful and make sure that you attend the party in your best attire. If you are not dressed properly, you are going to have a lot of trouble making a good impression on any potential dates.
Do not hide in the corner but try to be prominent so someone can approach you. You should interact with the people as much as possible and mingle with the singles.
If you know a friend or two at the party, you might want to stick with them and ask them to introduce you to potential dates. You are more likely to find someone this way and a proper introduction will improve your chances too.