Incomplete: See a Washington national game in person

I did see a Washington national spring training preseason game during spring break at their stadium in DC versus the Baltimore Orioles but it wasn’t an official MLB game that counted toward the season record.  But I’d already seen all 30 stadiums because I’ve seen the Montreal expos before they had moved to Washington, but of course I could most likely redo all the stadiums because a lot of them have been rebuilt since the late 90s.