Event #2: The Opener is boosted with a $250,000 guarantee and stretched over four starting flights. The 2023 Thunder Valley Circuit schedule looks similar to the previous year, starting with a $400 Seniors Event followed by the $400 Opener. The series will run between September 28 - October 9, featuring 13 ring events and almost $1 Million in guaranteed prize money. Las Vegas, Nevada (26 September 2023) - The World Series of Poker Circuit is back in Lincoln, California, for another Circuit at the beautiful Thunder Valley Casino Resort. The WSOP Circuit is back in Northern California with 13 ring events and almost $1 Million in guarantees.