Spoilers for Francesco's route!
For those who are in desperate need of help for Francesco's route with the purse, I will come to your aid:
First, go to the bar. The bartender will drop a hint.
After that, you have to go to the dark corner. I think you have to look in these two spots, not necessarily in that order, before finally going to the front, where the sound stage is. The thief's masks will lie there.
Finding the masks should unlock a "center of the crowd" option.
Hope this helped