VIP Membership

Allows admins to move users to certain groups for a certain period of time and put them back to a group of their choice once the expiration date has passed.
Admins are PM'd when someone adds someone to a new membership.
Admins are PM'd when someone's membership expires.
Users whose membership expires, are alerted too. (via PM)

thanks to all mannnnnn!!!!!!!

Pretty good, but there is a free plugin that has this and automatically does it.