I don't know how it works on the 3 and 4 day cruises but on the 7 day after you board you go straight to Sessions Bar. The concierge team is there waiting for all concierge level guests. That is when you sign up for any dinner reservations for Palo, teas, spa treatments, excursions, galley tours, bridge tours, children's programs (they even have the pagers there), hair braiding. There are time slots blocked out for the concierge levels. We were able to have our daughter's hair braided (entire head) the first full day at sea. I noticed the next day there were sold out for appointments! It came in handy to go to Sessions and do it all there.
Kathy