Mawlid is the observance of the birthday of the Islamic prophet Muhammad.

Some images

A procession:

Some articles from a cursory internet search: Huffington Post, Wikipedia

There is some inconsistency in the lessons between Maulid, Maulidi, and Mawlid, concerning which spelling(s) can be used in which language. And if I could I would submit "birthday of the prophet" as a correct translation of maulidi, just as "Farmers Day" is a correct translation of nanenane.