How can a legitimate Islamic wedding ceremony, free from prohibited elements such as musical instruments and music, be held while still showing joy and happiness and avoiding boredom for attendees?

Joy at a wedding is a legitimate blessing, and wedding customs are based on permissibility and latitude, provided forbidden things are avoided. A Muslim should conform to the customs of their people unless they contradict Islamic law or cause embarrassment. Scholars have cited the hadith prohibiting garments of fame as evidence for this. Therefore, hold the wedding ceremony according to what people do in your country, and avoid forbidden things such as musical instruments and intermingling, while permitting singing without musical instruments, banquets, gatherings of people, and displaying adornment.