Kek or Cringe: Theater/Club Glod except BLUs vote "Kek" or "Cringe".
Green Day: REDs can not move down at all. You can choose to allow/disallow crouching here. Can make variants disallowing going up or changing elevation at all. (Also, yes, the name is a JoJo reference xd.)
Timer Day: Some variable changes depending on the round timer. Example: When the round timer's minute is an even number, REDs are renamed to REDs, but when it's odd, REDs are renamed to Yellows. Maybe a bit of a confusing concept, but something I made up.
Player-Count Day: Essentially the same as Timer Day in the sense that a variable is changing, but instead of it being based on the round timer, it's based on the amount of players alive. Never tried this out before, but I assume it'd be possible supposing the warden was reasonable with his/her orders.
Also, I hate to be "that guy," but;
Obstacle course with friendly fire
That's Meat Grinder-ish.