I want to add to this, arena with multiple rounds (3, 5, 10, 30) and a game like cs in arena (plant the bomb/defuse the bomb) but instead of base use a castle and instead of bomb use a flag. The team with the flag must conquer the castle and set the flag in some location. if flag stays in that location for ~10 seconds then that team win. Random pler get the flag, the flag can be dropped, ad it appears on ground and can be taken, if player with flag dies, his body glow, and any other player from its team can take it.
After flag is set in location, if someone from castle defender team get it, then game is won by his team.
Or this can be an event not arena, where any number of players can go, and it takes place only 1 or 2 days/week.