Here’s a quick one to get everyone in the mood.
Mission Type: Minor
Mission Length: 45min
Field Type: Any (Same size as football field with marked endzones)
Requirements: Rucksack for a football, marked endzones
Concept: Football with guns
Teams: ~20 players total, divided into 2 teams
Objective: Score the most touchdowns
Rules:

Set up a football shaped and sized, or smaller field with end [...]

Mission Type: Minor
Mission Length: 45-60min
Field Type: Any
Requirements: None
Concept: Zombies with guns are coming to get you
Teams: Starting teams are 1 man versus everyone else
Objective: The scenario here is that one of your unit’s soldiers has become infected with a virus that turns them into an evil zombie.   The new zombie warrior is obsessed with [...]

Mission Type: Minor
Mission Length: 30-60min
Field Type: Any
Requirements: None
Concept: Every man for himself
Teams: No teams, every player is a team of one.
Objective: Be the last playing left alive on the field. Eliminate all of the other players on the field.
Rules: There are no teams here, so field placement is important. Players take the field [...]