Your protest will need at least one (possibly two) flags: One that says “Don’t tread on Me” and/or one that says “Come and Take It!”.
Your number of protesters must match or eclipse the number of people meeting inside. Protesters should remain outside - quiet, with faces covered...
... and visibly armed.
Wanna make the news? send a clear message without saying a thing?
If they (LEO and media) saw that at EVERY location that day...
... well, just think about what it could do.
I would think along with the flags, a large sign reproducing the text of the second amendment should be held up.