First of all you will need a large group of people. The game is played at night in a safe environment, away from roads. A ball field surrounded by woods on private property would be a good location.
First of all you will need at least 10 or more people to be the "aliens". These are people who are willing to hide up trees, behind bushes and under benches in the pitch dark for the duration of the game. The rest of the group should be divided into teams named after colours, i.e. Blue team, red team, yellow team, etc. About 5-6 people per team is good. Each team must have one flashlight, which they should try to use as little as possible so as not to give away their location to other teams, especially when finding one of the "aliens".
Each Alien is given into his or her possession, in addition to other objects that you can decide upon, several of those light sticks that are activated by bending them in half. Assorted colours are needed, one for each team colour, i.e. blue, red, green, yellow, orange, purple, etc. Also a number of the stripey light sticks are needed which are worth bonus points.
The aliens should change their positions frequently making them more difficult to find by the teams.
Step 1: The task
The task of each team is to find as many of the aliens as they can and persuade them to hand over a light stick of their team's colour, i.e. Red team needs to collect as many red light sticks as they can, blue team as many blue, etc. This is relatively easy at the start of the game, but towards the end they will have to make do with any colour stick, or no stick at all - but perhaps a silly hat or even a piece of paper!
The aliens will not give the sticks away for free, but might ask the players to sing a silly song, or recite a poem, bring them something that they can find on the site (in the dark) or answer a question correctly before they will give the reward. If the aliens are so impressed by the song, answer or whatever they might give out one of the precious stripey bonus light sticks to a team. The teams must be mindful that other teams are in the area also seeking the aliens, so try not to give your location away.