Around the country, events on the 23rd of each month have included rallies, vigils, replica solitary confinement cell installations, chalk outlines of a cell, reader's theatre presentations, film screenings, and panel discussions.
American Civil Liberties Union - Facts sheets, advocacy tools and news
American Friends Service Committee - FAQ, first hand testimonials, reports, videos and more
Solitary Watch - News articles, FAQ, Solitary 101 presentation
T'ruah: The Rabbinic Call for Human Rights - Various Jewish resources on solitary confinement
You could host a viewing party of a documentary. The new film Solitary: Inside Red Onion State Prison debuts on HBO on February 6, 2107, and will be available throughout the month on HBO Go/Demand. A viewer's guide for Solitary is available for download free of charge.