Mayhem was a SoCal monthly organized by MacD and was stream on his Twitch channel, MacDSmash. Although it can be considered a local, each event usually has over 100 entrants with the July 2015 event in particular attracting over 300 entrants. It was started in January 2014 and has occurred every single month until June 2016.
Super Smash Bros. Melee singles
Super Smash Bros. Melee doubles
Super Smash Bros. for Nintendo 3DS singles