Does Rambam give any reasons as to why Jewish celebrations always involve a festive meal? Can you also give me references which I read myself? Thanks

Hi, Two questions have been bothering me- 1) When we try to understand how an omnipresent G-d could create a world which is not Him, people answer with the concept of tzimtzum, saying "somehow G-d contracted Himself, so to speak, and this makes it possible." We are told that understanding such a concept is possible only through serious learning of Kabbalah, which most of us are not capable of. I know that a person cannot expect to understand everything, but such a basic question seems to be in the "mystery" category. What makes this different than something like the Catholic concept of Trinity, which makes no logical sense but is also said to be just a mystery that the human mind can't understand? Or is this something we can accept based just on proofs pointing to the truth of Matan torah? 2) Why would the existence of a G-d neccesarily obligate us? If the human mind can't understand G-d's "way of thinking," why do we assume that He created us for any reason that we can understand? Why would the existence of a G-d neccesarily lead us to look for proof of any instruction from Him? Thank you very much!

Does the Torah prohibit listening to non-Jewish music?

I know a black guy, very devout Baptist. He's always into religion, bible, theology, church, his lord, etc, etc. Recently, he asked me for the old testament, he wants the five books of moses. He wants to read it and go through it. I'm not sure what to do. Should i get him a set? if so, what kind? an artscroll? he's very interested in this, and i'm not even sure how to explain the concept that our Torah is more than just the bible - torah, nevaim, kesuvim, ba'al pe'eh and all of that. i'm not sure what i should or should not tell him. how am i supposed to handle this situation? what's allowed, what's inappropriate, and what should i do? Thanks!

DEAR RABBI, I HAVE A NIDA QUESTION MY HUSBAND AND I HAVE BEEN MARRIED FOR 3 YEARS AND HAVE HAD TROUBLE CONCIEVING LATER I LEARNED THAT I HAVE NOT BEEN COUNTING CORRECTLY AND I WENT TO THE MIKVEH AFTER I OVULATED. MY HUSBAND ALSO HAS A LOW SPERM COUNT BEFORE WE TRY OTHER AVENUES WE WERE TOLD TO TRY AN OVULATION STICKS. ACCORDING TO THE OVULATION STICK I OVULATE 1 OR 2 DAYS AFTER MY MENSTRAL CYCLE. MY MENSTRAL CYCLE USUALLY LASTS ABOUT 5 DAYS. I JUST STARTED USING THE OVULATION STICK IF THIS CONTINUES AND IN FACT I DO OVULATE 1,2, OR EVEN 3 DAYS AFTER MY PERIOD CAN I GO TO THE MIKVEH SO SOON ???? AND IF NOT WHAT HAPPENS THEN???