Mayim Acharonim Chova!

I am putting this analysis here for those who will listen to these lectures, for context and clarification and so nobody falls victim to sinat hinam or mistaken conclusions.  I sincerely hope you benefit from it. I invite honest comments and encourage debate with the following conditions for comments: 1. Admit to and accept the truth of anything for which you cannot find evidence for objection or dispute and 2. Anything proven as the pashat (simple foundational meaning) of the words of our sages in the Gemara, that you do not apply irreconcilable interpretations or exegesis.   The first lecture on Erev Rav seemingly disparages prayer at the graves of the righteous, so I would like to present a few sources to clarify where this tradition comes from and assert that the overwhelming consensus is that it is both called for, permitted and even required at times.  Even the Rambam's Mishna Berurah on Shulchan Aruch, O.C. 581:4 explicitly states that "one should not direct...