Portland police say they’re prepared to respond to several May Day protests planned for the city Thursday afternoon and evening. But they don’t know whether to expect hundreds or thousands or tens of thousands of people on the streets as temperatures reach a high of 82 degrees on what is a work day for most people.

The international event, which commemorates the fight for workers’ rights, has often been used to express broader political unrest. This year, President Donald Trump and his administration’s actions are front and center.