Meaning of “fit in with sth” - Learner’s Dictionary

fit in with sth

phrasal verb with fit us uk /fɪt/ verb present participle fitting, past tense and past participle fitted

B2 If one activity or event fits in with another, they exist or happen together in a way that is convenient:

The party is in early June. How does that fit in with your plans?

(Definition of “fit in with sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)