This post may contain affiliate links, but all opinions are 100% mine. For more information, please visit my Disclosures page. Y'all must know by now I love a good themed birthday party. See, for example, our Arctic Birthday Blast, Pirate Party and Star Wars Party. It was no different when Biggest asked for a Harry Potter party this year. Holy goodness, it was so much fun. Most of these ideas I got from Pinterest, for original sources please click through to my Party On Boys Pinterest Board…