Nonprofit and public meetings

I belong to a very small nonprofit organization. Our constitution and bylaws require 4 yearly membership meetings for the members to conduct organizational business. The constitution says nothing about the membership meetings being required to be public.

Does PA law require public meetings even if the constitution does not spell it out? And what would constitute 'public'? We don't have the resources to rent a conference room or something similar just for that purpose 4 times a year. - Is this your question? Add additional information