Area Committees are a joint meeting attended by both city and county councillors. They decide on planning issues in the area, but also have a role in the allocation of community development money from S106 contributions. They offer an opportunity to engage with multiple councillors at once, through the Open Forum section and speaking on specific Agenda items. The East Area's website is here: https://www.cambridge.gov.uk/east-area-committee
Speaking at these meetings is a good way of making your feelings on matters the councils control public.