May One Get engaged During the Three Weeks?
Yes, one may get engaged throughout the entire Three Weeks including Tisha B’Av. Prior to Rosh Chodesh Av (excluding the fast of 17 Tammuz), a formal meal may be served as well. From Rosh Chodesh Av until Erev Tisha B’Av, only refreshments such as cakes and beverages may be provided (Shulchan Aruch OC 551:2 and Mishna Berura ibid. 16).