The most effective way to ensure that one committee member can see more than another is to assign them different Data Administration Access. For example, if you assigned a committee member Data Administration Access for events they could access event administration pages. A committee member without Data Administration Access for events would only see the events pages a regular member could see. See: Access Levels and Member Logins.
It is also possible to give some committee members to access a document and for other committee members to not have access. See our Committees and Team information as found on the Managing members, friends and sponsors in the Making Music Platform help guide.