There will be stalls operated by the following list of interesting and relevant organisations present at the AHS convention. There will be various points in the course of Saturday where you can get an opportunity to browse them.
National Secular Society
Dignity in Dying
Central London Humanists
Faith to Faithless
Conway Hall Ethical Society
Effective Altruism and 80,000 hours
British Humanist Association
Check back regularly as more stallholders will be announced soon!