הלכה על מגילה 56:5

And one should not engage in financial calculations inside of a synagogue or beit midrash unless they are calculations that pertain to a mitzvah, such as calculations of a tzedakah fund or for redeeming captives etc. And there should be no eulogizing in a synagogue unless it is a eulogy for a great person. Or, if the eulogy is relevant for an influential resident of the city such that many  residents fo the city will gather to pay tribute to the deceased and the entire community will gather in honor of the bereaved relative...