$ROOT driven events
Is this the rebirth of Team Liquid attacks?
TL attacks was a good concept. You had known players being invited 1 per event. They were to play custom games with rules that varied a lot. Their opponents were fans that correctly answered trivia questions.
Since there were professionals vs amateurs, the custom game rules was often very debilitating. They also changed during the game, at iNcontroL's whim.
The Trial of the Xel'Naga, hosted by RedBull, was also a great event. 8 professionals teamed up with 8 fans, playing 2v2 on custom maps with very distinct features. Viewers got to vote on what was to happen, e.g. moving all mineral nodes to the middle of the map, landing a nuke in White-Ra's base, or unleash a mighty demon that attacks anyone.
Having a laughing Day9 pushing the buttons whilst commenting the games was amazing (Husky was also present).
These non-1v1 standard game events have fallen to the wayside. I wish for more big events with non-standard games. The ones that are happening now are so small that I often miss them when they are happening and I only find the VoD a few months later.
Example: Mappers' delight hosted by Creighton Olsen. I found out about it when he mentioned the conclusion of the fifth edition when commenting another event.