Millions of people across the country are expected to join in protest this weekend against Donald Trump’s administration, a movement intended to coincide with the president’s planned military parade in Washington — and the commander-in-chief’s 79th birthday.

Thousands took to the streets for the ‘No Kings’ protest across the U.S. Here’s what we know about the turnout and the movement’s message.

The movement, explicitly anti-Trump and anti-authoritarianism, is encouraging cities nationwide to organize and demonstrate on Saturday.