Groovers'n'Movers is a time limited hobby event involving the Aerobics hobby. It will start on 3rd October 2017 and will last 7 days for players to try and get new active wear outfits. If you didn't start or finish the Grooving Guru quest or Aerobics hobby, the pop up will still show, but you will be unable to start it.
In game description is as follows:
A wave of Aerobic exercise has swept over Simtown, it's the latest - and grooviest - trend! Participate in this Aerobics event to win a new suite of groovalicious Activewear for your Adult Sims!