.*\.aauwnc\.org/\([0-1][0-9].*\) -> archive.aauwnc.org/\1 (RE may be wrong, but you get the idea. The Broken Link Checker makes it easy to fix, but tedious.
Replace shortcodes
Delete references to “registered” — add to “Notes on this website”
Convert to Gutenberg and delete content related shortcodes: “miniloop”, others?
Other
Remove all php files from archive.aauwnc.org — add to “Notes on this website” to document, e.g., online registration as early as 2002.