In your example, you are using your next action list to track project support information. The project is "arrange tennis match" or equivalent. The project support information is the list of participants and their status. You can put this in the note field of the project in Omnifocus or elsewhere. Seven days beforehand, your next action is to email participants requesting confirmation. Two days later, your next actions is to tally confirmations and send another email to those who do not confirm. And so on. With email threading, it's pretty easy to do this. You do not need to track individual emails, just mark people as confirmed when they confirm. Of course, if someone has to cancel, then you have more actions, such as "call Tom re sub for Bill" or whatever is appropriate.
Originally Posted by timjamesbrennan