Lord Srinivasa is Pratyakshablvam in Kali Yuga. In his celestial wedding the moola sloka is "Mangalyam tantunanena Jagath rakshana hetuna: kanthe badhnami subhage lokanam mangalam kurum" The purpose of Lord Srinivasa KalyAna Mahotsavam is for the protection and prosperity of you, your family and the whole Universe. The word "uth" means grief & "savam" means to remove it — hence performing or participating in his celestial wedding of Lord Venkateswara will remove all difficulties.