http://q13fox.com/2018/05/09/50000-v...over-contract/
On May 22, they will vote whether or not to strike, which would take place as soon as June 1 if approved.
This is the Culinary Union, which covers restaurant workers, housekeepers, and a lot of other hotel staff. It does NOT cover casino employees.
If this strike were to take place, the WSOP itself could still operate, but restaurants on properties may be closed or crippled, and hotel operations will also suffer immensely.