If this already is implemented in-game, please some moderator close this. I'm not sure because I've never seen it.
Well, the basic idea is this: Just like in some servers, when the match ends, the map switches, I suggest we have the ability to change the gamemode after matchs too. So we could have, e.g:
TC on Gen. Match ends.
Next match: CTI on Normandie.
Next match: TOW on UrbanTankFight.
Next match: TDM on Goon Assault.
etc, etc.