Mystery Solved...Local Bleachers Built for Siyum HaShas

I was wondering what all these massive bleachers I saw today were for, near our neighborhood in Givat Hatachmoshet. Apparently those bleachers being constructed are part of the preparations for one of the many Siyum HaShas events taking place, though I'm not sure which. Yeshiva World has some pics and videos if you have no idea what I'm talking about.