Libguides for All! At SpringyCamp by Karen Grondin, University of Arizona Includes code she used to fix accessibility issues!
ACRL Universal Accessibility Interest Group (UAIG)
UAIG listserv. You can join the listserv by creating an account for ALA Electronic Discussion Lists. Use the link for "first login". If you are a current or prospective member of ACRL, you can join UAIG at no additional cost, as part of ACRL membership. You do not need to be a member to join the listserv.
ACRL TechConnect Blog accessibility tagged posts
Accessibility and Libguides by Springshare. This focuses on creating accessible content within Libguides and includes links to other librarians' guides to accessibility of Libguides as well.
Introductory Tips for Accessibility of Libguides part of a CUNY presentation on Libguides and best practices