Resources for progressive commitment ceremonies / weddings / marriages / partnership / etc.

I’m looking for web, book, organization, or other resources—history and meaning of specific parts of the wedding ceremony, politically progressive analyses of traditional weddings and marriage, alternative ceremony ideas, inclusive wedding models, non-religious wedding models, how to handle weddings between families of very different class/cultural/religious background, lifelong commitment as part of a radical agenda (arguments for/against lefties getting married), arguments for having children/family and alternative family structures, ....... any related information.