Post some minigames to try!
One I once played with a few of my guild members:
Shuffle Survival
In the tier 3 section of the Private Training Hall, all the players equip their Proto equips (Spiral Helm/Armor, Proto Shield, and any combination of Proto weapons) and go into the Shufflebot Arena.
The person who survives the longest wins. (If you die once, you leave the arena after reviving.)
You can try to knock Shufflebots into other players to make them die faster - Proto Bomb is best for this.
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What other minigames have you thought of?
I would link the video of the Lumber Bowl here, but apparently that video is unavailable now.
R.I.P.