As a military-style parade rolls through Washington, DC on Saturday – President Donald Trump’s birthday – millions are expected to take to the streets to form what organizers believe will be the strongest display of opposition to the administration since the president took office in January.

A protest group has encouraged demonstrators to book up tickets to the military parade this weekend, in an effort to leave seats empty.

President Donald Trump’s warning that protesters of Saturday’s US military parade in Washington, DC, will be met with “very heavy force” threatens to chill speech and underscores the need for protesters to take precautions around digital surveillance, privacy advocates tell The Verge.