Well I found the probable source in R. Akiva Eiger's responsa (vol. 1 ch. 29) where his uncle R. Binyomin Wolf Eiger make a feast in honor of R. Akiva Eiger's wedding.
R. Akiva Eiger responds (ibid ch. 30)
תודות אלף אל אדוני על הדבר אשר עשה לשמוח ביום שמחתי בפומני והוא אות
נאמן על עזוז אהבהו, אם כי לא ידעתי על מה, ותשואות חן לכם...וכו
A thousand thanks to my master regarding what he did, to rejoice on
the day of my wedding, which is a sure sign to the strendth of his love,
though I don't know why [he celebrated like this]...etc.
Thus he certainly didn't advocate the celebration, and his response indicates that he thought it was a strange practice, (assuming this is his intent in saying that he doesn't understand what they were celebrating).
There is some possibility however that he merely humbly writes that he doesn't understand why his wedding is reason for such celebration.