Regarding likely protests at the military parade: I prefer boycott over protests.

[Wiz Imp]

7. There will be no large crowds of protestors in DC.

A couple of groups have applied for permits:

https://www.axios.com/local/washington-dc/2025/06/10/counterprotests-june-14-military-parade

-A pro-democracy group is rallying 200-300 people at Fort Reno Park, according to a National Park Service permit application.
-Two other rallies — an "Equity March" and "Refuse Fascism" protest — hope to draw 500 people each to downtown, per an NPS application.
-A different group of organizers in D.C. cancelled a military parade protest that hoped to attract up to 20,000 people Saturday. They had originally planned to gather at Meridian Hill Park and walk to the National Mall.

That's a total of 3 (only 2 on or near the mall) with a "hoped for" total attendance of 1300. Groups have paid attention to the "No Kings" organizers to stay away from DC while protesting literally everywhere else. Note: the "Refuse Fascism" group's last protest in DC in may drew less than 100 people. Also, people should avoid that group - they have ties to the Revolutionary Communist Party.
https://en.wikipedia.org/wiki/Refuse_Fascism