Gemara:

Megillah,  Pesachim 

Halacha:

Beit HaKenesset 

Collections: R' Grunstein Eating and Drinking in Shul

References: Pesachim: 101A ,  Megilla: 28A ,  Megilla: 28B  

Description

The various answers to why 1 Gemara prohibits eating/drinking in a shul and the other allows it will dictate if you can have a Yarzeit "tikkun" in the shul. But perhaps 1 letter vav would determine the REASON for this prohibition and thus the leeway of the allowances