From: Rabbi Moshe Sofer
To: Rabbi Itzik Leib
A rabbi institutes an extra aliyah each Shabbos to fund communal Talmud Torah education, prompting questions about whether it extends to Yom Kippur falling on Shabbos. The Chasam Sofer endorses the practice on regular Shabbosos but advises against adding on Yom Kippur.
Source: Shu"t Chasam Sofer OC §171