Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
The workaround in the past for youth in Scouts BSA units was to create a dummy SB account for the SPL/Scribe/Webmaster to use. The workaround is described in the following post.
Will the SSO requirement starting Nov 4th impacting SB logins, will that effectively end this workaround for youths to update the calendar?