The annual great lakes medieval fair starts this weekend, and continues every weekend until August 13th. Every weekend there is a new theme, which can be found on the website. More importantly, July 29-30th is pirate/mermaid themed! They encourage you to dress up, and there are many shops around the fair selling medieval-esque clothing, from gypsies to kilts. It's fairly large, and many people attend. There are many, many professional cosplayers who also attend, making for some nice photo opportunities. Website linked below.
http://www.medievalfaire.com/index.htm

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