Um, no. You’re putting words in my mouth. Concerts and ball games are entertaining because there is a lot of sensory stimulation. I don’t feel the need to get up and “do” something because there is so much noise and excitement going on (no, sorry, the “noise and excitement” of men dancing doesn’t cut it). But you know, fans at a baseball game are not really passive. They wear their team jerseys and colors, they stand up, they cheer and boo loudly, they mug for the cameras, they try to catch balls. Concertgoers likewise stand up, sing along, mug for the camera, and hold up signs. Can you imagine the women literally jumping up and down and cheering on their husbands and sons in shul? That would be really bizarre.
And actually, yes, allowing male audience members onstage at a concert WOULD make the concert more boring, because it would block my view of the singer and generally take the focus off the singer. (Again, since the Torah can’t perform on its own…not a great comparison.)
I’m going to go out on a limb here and say that most Siyum HaShas attendees don’t show up to be entertained.