Q. Re- question above on the Tikun (meal) offered in our Shul after the end of Tisha Beav. Since on this year that Tisha Beav was on Sunday, there will be no Melave Malka at the end of Shabbos, is it then correct to wash at that Tikun and consider it to be a late Melave Malka?
A. On a similar question (3250) we wrote: “Shaarei Teshuva (O.H. 30: 1) writes that the Neshama Yiseira (extra holy soul) granted to us at the beginning of Shabbos, stays with us after Shabbos ends, only until Chatzos or the midnight on Motzei Shabbos, so the seuda or meal celebrated to honour of the departure of that most elevated day should be observed until before midnight. Mishna Berura (ibid. 2) mentions that this should be eaten as soon as possible after the end of Shabbos.
Chashukei Chemed (Pesachim 102b) deliberates when one only gets the wine necessary for reciting Havdalah after midnight, if he should wait until after Chatzos and eat then Melave Malka only after saying Havdalah or follow the opinion of Shaarei Teshuva and not eat that seuda after midnight. However, Oisrei Lagefen (p. 551) maintains that if one has not fallen asleep yet, one can eat Melave Malka even after Chatzos. Beis Yisroel Hasholem (p. 200) mentions that the Kristirer Rebeh would celebrate Melave Malka until three hours after Chatzos.
Zemiros Leshabbos (p. 183) quotes that the Divrei Chaim once told his grandson Rabbi Shlomo Halberstam, the first Bobover Rebbe, to follow the Rofshitzer Rebbe's minhag (also his grandson's forefather), who would not eat Melave Malka on Motzei Shabbos, because he just could not cope with the departure of the Shabbos Kodesh, so he rather ate that seuda after davening on Sunday.”
It is mentioned in Chassidic sefarim that some Rebbes would make a Seudas Melave Malka on Tuesday also (Zemiros Shabbos Sholom Umevorach p.157).
Horav Shlomo Miller's Shlit'a opinion is to follow the opinion of the Mishna Berura and there is no place for a Melave Malka on Sunday night.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a.