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I often play doubles in tennis which requires 4 players. I sign up for a court and then start texting, calling, emailing, etc. until I get 3 other guys. It is very time consuming to get the 3 other guys who are going to join me. I would like to develop an app that can send out an invitation to a large group of people to play. I would select the invitees by clicking a circle next to the name of the contacts I choose. The invitation would include details (where we are going to play, court number, time of play) that would allow the invitees to respond. The responses would either be "yes," in which case a green checkmark next to their name would appear, or "no," in which case a red x next to their name would appear. After 4 players (including me) had green check marks next to their name no one else would be able to check yes to play--the 4 players (including me) would have been found. As the inviter of the game, I would also like to have the ability to "pre-check" for anyone I want in case I already know someone who wants to be included. Finally, I would like to be able to choose singles or doubles from the beginning so that the app knows how many people (2 or 4) are required before it precludes additional acceptances.