Verses with the word solemnity in the Apocrypha (2 verses):

Sirach 50:19
And the people besought the Lord, the most High, by prayer before him that is merciful, till the solemnity of the Lord was ended, and they had finished his service.

2 Maccabees 15:36
And they ordained all with a common decree in no case to let that day pass without solemnity, but to celebrate the thirtieth day of the twelfth month, which in the Syrian tongue is called Adar, the day before Mardocheus' day.