I dunno if I like that idea... She might feel attacked/spammed? How about just asking if she's ever considered having a few concerts abroad? Rather than a hundred messages saying OMG YOU
HAVE TO COME TO EVERY CONTINENT AND HOLD ONE CONCERT! SERIOUSLY WE LOVE YOU EVER SO MUCH!!!!
In other words, I like the idea of bringing the subject up, but I'm not sure if a twitter bombing is the way to do it?