q&a page 19
916) Q: My grandson, who lives in Eretz Yisroel for good, came here to America for the Yomim Tovim. He observes only one day of Yom Tov, since he made aliya to Eretz Yisroel last year. Is he permitted to eat here in the Sukkah on Shemini Atzeres?
A: He should eat in the sukkah with you, in order to not disparage the Yom Tov, but he should say to himself (or if there are more than one in the group of Bnei Eretz Yisroel, they should quietly say to each other) that he is not sitting there in order to do the mitzvah of sukkah. (See Sha'arei Teshuva Siman 668 Os 3, quoting the Chida in Birchei Yosef)
917) Q: Is it permitted for an adult to create art on Chol Hamoed? May they participate in a paint night/class? Does it matter how talented one is?
A: Generally, amateur art is permitted, while more professional art is prohibited.
There are those who are more stringent. See Shu"t Avnei Yashfei Orach Chaim Vol. 1 Siman 110:2
918) Q: If someone realized after baruch sheamar that elokai neshama was skipped - after shemoneh esrai it's a safek or assur to say,correct? What about saying elokai neshama right after yishtabach?
A: The best course of action in this case, is to have in mind by Shemona Esrei in the bracha of mechayei Hameisim, that you do NOT want this to exempt the bracha of Elokai, Neshama, and then after Shemona Esrei, say the bracha of Elokai, Neshama. See Mishna Berura Siman 52 S"K 9.
It should ideally not be said after Yishtabach, as being mafsik there is problematic.
919) Q: I understand that opening an umbrella on shabbos is not permitted. Being that it is temporary and not a permanent setup is this considered to be Boneh?
A: Yes, there are various melachos that can be transgressed when opening and using an umbrella on Shabbos, including Boneh and making an Ohel, and indeed umbrellas may not be used on Shabbos for any purpose, even if it was already open from before Shabbos. It is also Muktzeh.
See Shu"t Noda B'Yehuda, Mahadura Tinyana, Orach Chaim Siman 30, hazon Ish Orach Chaim Siman 52, Biur Halacha Siman 315 Dibur Hamaschil Tefach and Shemiras Shabbos K'Hilchasa perek 24:15
920) Q: Is it true that we are not supposed to put a purse on our eating tables? I remember hearing that because the table supposed to be like a mizbayach, you don’t put something so mundane as dealing with money on it or something like that.
A: The halacha that a person's table is likened to a Mizbai'ach (based on Talmud Brachos 55), mandates one to have salt on the table when eating (See Rama Siman 167:5) and also mandates the knife being removed or covered before Birchas Hamazon (See Shulchan Aruch Siman 180:5 and Mishna Berura there). I am not, however, aware of any halacha forbidding money to be on a table.
According to Kabalistic sources it is proper not to sit or stand on a table. (See also Shu"t Rivevos Ephraim Vol. 6 Siman 95 and Sefer Chasidim Siman 920)