Did the Prophet (peace be upon him) attend weddings before his prophethood, and was the dancing of the Abyssinians inside the Prophet's Mosque considered dancing?

The Prophet's — peace and blessings be upon him — witnessing of the wedding before his prophethood has not been authenticated, and the story mentioned in "Ar-Raheeq Al-Makhtum" (The Sealed Nectar) has a weak chain of transmission according to Ibn Kathir and Al-Albani. As for the Abyssinians playing with spears in the mosque, this is authentically reported in the Two Sahihs (Bukhari and Muslim), but it was not dancing in the modern sense. Rather, it was a form of training for jihad and shaking of spears, as explained by scholars.