Gemara:

Rosh Hashana 

Halacha:

Beit Hamikdash 

Machshava:

Beit HaMikdash 

Mishna:

Bava Batra 

Holidays:

Shabbat Nachamu,  Tisha Bav 

References: Bava Batra: 60B ,  Rosh Hashana: 18B  

Description

On all other major Holiday periods, there is a transition period from it back to routine. Why not after three weeks of mourning? Music: ותערב ושם נעבדך ישיבת אלון מורה