Again, someone correct me if this is dated, but for DL, I'm not aware of anything other than industry conferences (OBAP, WIA, NGPA, TPNx). And I believe they pulled out of TPNx recently (I think mostly due to the slowdown in summer hiring and the relatively large CJO pool). They don't do "meet the chiefs", afaik. Propel has had some extra events, but that's another animal.

I belive the FB recruiting page is the go-to source. Good Luck!