yeah there would need to be a page with the list of participants...then when you choose something you need to add something at the same time...then go to the list page and post your name and date you chose this triggering an e-mail to the next person to let them know it's their turn ...that would mean that the next person in line has 2 days to make their choice and add their item...if the don't do it in the time allowed they miss their turn and it goes on to the next person till it comes around again...
One of the rules to participate is that you must login once a week to check on things..
just ideas..