It is possible to modify CAB dates on individual meetings and to create a new meeting with multiple weeks on the agenda. CAB definitions are similar to a recurring meeting invitation. When you define a CAB definition, it determines the attributes that are associated with all CAB meetings generated from that definition.
CAB meeting scheduling.
1. "Create a single CAB meeting occurrence" https://docs.servicenow.com/bundle/kingston-it-service-management/page/product/change-management/task/create-a-cab-meeting.html
2. "Create a CAB definition" (reoccurring CAB meeting) https://docs.servicenow.com/bundle/kingston-it-service-management/page/product/change-management/task/define-your-cab.html