You won’t find much peace in June, it’s peak season for field trips from the schools around the country. Hint, they take red eye flights because they are the cheapest and are so excited, nobody gets any shuteye on the way in.
But that's only on NPS land. Elsewhere, DC is very protest friendly. You can generally just start up an impromptu protest. Outside of specifically targeting people's houses, there's no need to contact the police. MPD will even direct traffic for your protest if they see one.
All but the absolute biggest and most historic marches really don’t take that much space compared to the size of the National Mall. Come whenever and enjoy!
I don’t know about this far in advance, but I hear about much of those things on DCist, which is a local news blog. It’s also a good way to find out about cool stuff going on in the district while you’re visiting. Hope you have a nice visit.
rlezar t1_ja4z29m wrote
Not sure what you mean by touring "in peace," but DC gets hordes of tourists all summer long, regardless of any specific events.