There is a prepostional phrase "to classes being cancelled" and the object of the preposition is a participle phrase, headed by the participle "being". The word "classes" is the subject of that participle and "cancelled" is the complement. The word cancelled is a passive participle.
This isn't a special pattern to learn, its just building up a clause from lots of simple blocks. The verb "led" has a prepositional phrase as its complement. The prepositional phrase has a gerund/participle as its object The gerund participle has a subject, and a verb in the passive voice.