Reference: Majmoo’ al-Fataawa wal-Maqaalaat al-Mutanawwi’ah – Volume 21, Page 101
Question: Is it legislated to [offer] people remind[ers about Islaam] during wedding celebrations, particularly since many people who are in attendance generally do not hear such reminders; and may Allaah reward you with good?
Response: From that which is very appropriate is to offer [religious] reminders to those in attendance [both] from the men and women at wedding celebrations; [and to do so] with that which is obligatory upon them [to fulfill] from the rights of Allaah and obedience to Him, [in addition to] assisting one another upon righteousness, as well as [to advise them] upon the truth, and warn them against everything which Allaah has forbidden. Along with [this, to] encourage [them] upon marriage, and urge them to minimise [all] [marriage-related] expenses – such that more [of the people] can [afford to] get married, [إعفاف] can increase [both] for the men and women.