Sessions update and folder hierarchy for housekeeping.

[nateynateynate]

Description

Moves session metadata into folders for ease of scanning. Changes a few sessions, adds a waitlisted session, and removes a session.

Issues Resolved

3214

Check List

• [x] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the BSD-3-Clause License.