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.

Hundreds of protesters took to the streets of downtown Portland on Wednesday for May Day, also known as International Workers Day, joining worldwide marches to demand stronger labor protections, livable wages and immigrant rights.