Backstab: At the beginning of each initiative, if any 2 allied pieces are adjacent, roll a save 11; the piece with the highest build points takes 10 points of unavoidable damage. If they are the same piece/point cost (ie: Aqualish Assassin/Chadra-Fan Pickpocket) nothing happens.
Countdown: Just like standard play, but with a short time-frame. We play 200 pts in 35 minute rounds. Helps get in more games, but still allows for high point squads.
Dream Team: Play whatever you want, no faction restrictions. Darth Vader and Han Solo in Stormtrooper Armor on the same squad? Go for it!
Dynamic Duo: Your squad must contain only two characters, and it must equal exactly 100 points. Cannot be 99 or 101 points. Faction rules still apply. We typically also use the "Iron Man" format where we play on Tiles instead of full sized maps, and then we do 3 full tournaments in one evening. For those events, must bring a separate squad and tile for each tournament to be played that night.
Epic: You build a 500 point squad which contains a maximum of 16 characters (Reinforcement/Reserve abilities may break this limit). You may only have 3 different Commander Effects. Gambit is 15 pts per round. Note: multiple instances of the same CE (like two or more Stormtrooper Officers) on your squad only counts as one Commander Effect. Uses maps typically legal for 200 point DCI.
Faction Pure: Squad can only contain pieces from the same faction, and may not include Fringe. Cannot play a Fringe only squad either, however Black Sun is considered a 'mini-Faction', so you could play a squad consisting of Xizor and/or pieces with the Black Sun SA or 'Black Sun' in their name. Mandalore the Ultimate's Conscription is in effect, as is Affinity.
Famous Pairs: Your squad must contain two Unique pieces that form an iconic pair from the Star Wars universe (Han and Leia, Vader and the Emperor, 4-Lom and Zuckuss, etc.). All other pieces in your squad must be non-Unique.
Inferno: At the beginning of each initiative, deal 10hp of UNAVOIDABLE damage to each friendly character occupying Hindering terrain (Yellow) or Low object terrain (Green).
Proxy Sealed: Played just like a normal sealed event, but you don't have to buy boosters. We use SWMManager or BlooMilk.com to tell us what pieces would be in a booster and we play with those. Get the fun of a sealed event, without spending $30-$45!
Reversal of Fortune: Player's squad may include 1 free Med Droid (12 pts). All pieces with more than 20 hp start the skirmish with 20 hp.
Tile Wars: Popular format developed by TimmmerB123 on the WOTC forums. Each player just uses a 5x7 tile (for a total map size of 5x14) to play on, creating a quick and dirty 'battle royale' style game.