Other ideas/suggestions for days:
-Gungame day: simple gungame.
-NPC day: this day try to kill npc can be zombie or something else, the first to kill 50 (can be more or less you can add a cvar) wins. Example:
https://www.youtube.com/watch?v=sTUQarxfGkU&t=
-Hero day: You can create some heros and the last one left alive wins.
If I can think of other days I will put them