Sprint lenght in Nexus with 3 teams

Hi! 

Imagine we have a Nexus with 3 teams with 4 weeks sprint lenght (each 4 weeks an integrated increment is delivered).

Team A: 2 weeks sprint lenght.
Team B: 2 weeks sprint lenght.
Team C: 4 weeks sprint lenght.

What happens with the sprint review and retrospective events of the team A and B? If in Nexus, the sprint review is replaced and the retrospective has some changes....