There's been some question about a memorial. I will pass on what I learned from another list. Peggy Bulger, the director of the American Folklife Center, has spoken to Archie's son, Derek. He told her that the family has not had a chance to consider the details, but that he anticipates a memorial/celebration in San Francisco after a month or so. Peggy added that the AFC would hold a similar event in DC, after the family event.
If I learn of either of these, I will post it here, unless someone beats me to the punch, which would be great.