Sam, the Gra says that there is only one machloket between the Zohar and the Gemara (whether one can walk past a person davening the Amida on the side – the Gemara is meikal, the Zohar is machmir). If someone thinks he found another either he didn’t understand the Gemara or he didn’t understand the Zohar of he didn’t understand either. As for inyanim, the Arizal is very strict about not weaqring black clothing on Shabbat. However, Rav Mordechai Eliahu says that today it is davka apppropriate as people today consider black clothing to be sharp and not the color of mourning. So it could be that teh issue of a non-Jew (during Chol HaMoed – Yom Tov is a halachic problem)could depend on the elvel of the local non-Jews, the relationship with him, etc. If excluding him will cause animosity then it is prohibited to exclude him for obvious reasons (BTW, the reason he cannot put up the shach is because he is not shayach to the mitzva. However, it seems that if we can be sure that he will not walk away he can be a dofen – Mishna Berura 630:55)
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