October is the most popular month for tourists and Halloween fanatics in Salem. The crowds start early and while Salem is fun at night year round..the fun really fires up in October.
If you are looking to combine Halloween fun with some a great night life scene..head to Rockafella's in Salem. They have Halloween themed dance parties every weekend in October with some really great ones coming up. I went to one last year Halloween weekend and had so much fun I plan to repeat the experience this year and have already decided on an awesome costume.