because all politics is local
One of the first things you should do when you are beginning to learn about your committee is to obtain a copy of the committee bylaws and read them.
The bylaws will give you important information such as when and how your committee members are elected, when and how officers are elected, how the executive committee is determined, when your committee has meetings, and other structural information you should know.
The bylaws are public information and should be on file at your county Elections Office and also with the Pennsylvania Department of State.
Some committees have their bylaws posted on their web site, so check there first. You might want to double-check with the committee’s web master and/or secretary that the web site version is the most updated version the committee has.