How do association members attend such meetings?

Regardless, I hope you agree that any action taken outside a meeting via unanimous agreement must be reported in the minutes of a following meeting. 

Below is from Maryland Homeowners Advocacy Alliance:

Maryland law generally states that all association meetings should be open to its members, but it does not specifically define what constitutes a meeting. In an attempt to resolve the ambiguity and provide clarity for those who wish to comply with the law, the Commission on Common Ownership Communities offers the following guidelines:

A “meeting” under the open meetings statute is any gathering of the board of directors or a board-authorized committee for the purpose of making decisions and taking action on the association’s business.

An “action without a meeting”, a provision found in some bylaws that allows the board to conduct business by email, texting, telephone, or otherwise not in person, is also a closed meeting and subject to the Condominium, Co-operative Housing, or Homeowners’ Association Acts.