This is a Crew vs. Crew fight, where crews compete for territory and members. (if your crew needs members and no one wants to join this may be the answer)
Davy Back Fights consist of three rounds:
1+2. The first two rounds use half of each crew (no one character can be in both), these can be a fight or some other contest agreed apon by the captains of bolth parties.
3. The final round is a fight between captians. (the captains can't be other rounds) the winner of that fight by forfiet or knock out wins the whole fight, regardless of the score.
Stakes: The stakes of the rounds can include, but are not limited to: a one man bet, a 5000 man bet, their ship, or just nothing.
This type of session shold be titled like this:
Davy Back Fight: Straw Hatts vs. Foxy pirates
One example of how the rounds are strctured:
round one: a foot race
rules: no soru users
crew A compeditors: A, B, C
crew B compeditors: 1, 2, 3
stakes: nothing