We have a sport association. To be part of the association, you need to register to our website (powered by wordpress). Every year we give a big sport event: members can partecipate in teams, playing volleyball.
Till now we made the following... - 1 member (the captain) registered to the webiste - he put personal data of all the players in a form
Now we want/need all the players to be registered to the website (once for the life), so we would like to do something like - players register to the website - captain creates a team picking other registered members (who have to agree with being part of that team)