1
general::
Phrase(s): blessed event
Fig. the birth of a child. • My sister is expecting a blessed event sometime in May. • The young couple anxiously awaited the blessed event.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
The birth of a baby, as in When is the blessed event expected? This expression combines two senses of blessed, that is, "happy" and "sacred." Today, however, unless used ironically, it is considered cloyingly sentimental. [1920s]
American Heritage Idioms