Simplified Rules of Order. Before a meeting can conduct business it requires a quorum--the minimum number of members who must be present at the meeting before business can be legally transacted. The requirement of a quorum is a protection against unrepresentative action in the name of the association by an unduly small number of people.
Extra credit: Sandburg volunteered for the U.S. Army and served in Puerto Rico (but did not see combat) during the Spanish-American War of 1898... Sandburg was married to Lillian Steichen, sister to the photographer Edward Steichen, from 1908 until his death in 1967...
Because Camilla was already married. Camilla married her ex husband in 1973 and Prince Charles and Princess Diana got married in 1981. Camilla was married for almost 10 years when Charles and Diana got married. I don't know why Camilla married her first husband but there are some rumors that Queen Elizabeth II didn't want Prince Charles to marry her. When he met Diana, the Queen wanted him to marry her, and that was what he did.