Under "Open" category - there is "Team Challenge", which you can sign up as a team of 4.
This allows your team the chance to to win an additional Team Challenge Prize - The prize is awarded to the team whose members score the most points during the event. The points awarded are based on individual entries submitted for the Competition Themes.
Even if you don't plan to enter as a team. It be good to gather your friends, so that you can help each other for the shoots for each of the themes.