We apologize for the confusion. The Tug of War event is scheduled to end at about 1:31pm PT today. Once the final round has ended, the event island will still be available, and all players can still attack bases through the Battle tab to earn individual points until 6:00pm PT.
Please note, any points you earn after the end of the final round will not count for your team. These points will allow you to unlock the prizes from the Points Achievements tab. Good luck!