b_h: Ahhhh my chaver, you shudda been clear about that in the first place! Of course a rally like you describe is L’shem Mitzvah. Protecting kevorim and Shabbos Kodesh is indeed holy and worthwhile cause to rally for.
That being said, surely you do realize the Gedolim shlita that call for these holy rallies are very specific in that it is to be attended by men only. And for good reason. Who are we to argue against the Gedolim? Aside from the fact it is common sense that the Gedolim desire it to only be men for the many reasons outlined earlier.
You did realize only men attend these rallies for a reason I’m sure.