Got the idea from this post. The tournament creator could consist of a private option.

Private-choose from a list of your friends. (Guild vs. guild has been implemented already, but still some players have no guild or they just simply decline offerings).

You also have the option to set time limit and if the matches are 1 versus 1.

Time Limit-choose how long (or short) you want the match to be.

1 versus 1-I am aware players are doing these already. I've thought "why not restrict UV's and trinkets".

Finally, you have survival mode.

Survival-Wave after wave of monsters from the clockworks rush at you. You have the deault LD maps so your goals are to either capture, fight mobs, or both within the time limit of choice. You may play this with up to 8 other players. Friends or guildmates you add will be your team.