October 11-13, 2019
From the event website:

Horizons: Perspectives on Psychedelics is an annual forum in New York City that examines the role of psychedelic drugs in science, healing, culture and spirituality.
In recent years, a growing community of scientists, doctors, scholars, and activists have orchestrated a renaissance in psychedelic research and practice.
Horizons brings together the brightest minds and the boldest voices of this movement to share their research, insights, and dreams for the future.
Now in its twelfth year, Horizons is the largest and longest-running annual gathering of the psychedelic community in the world.
Horizons Media, Inc. is a 501c(3) not-for-profit educational charity led by Kevin Balktick, Ingmar Gorman, Ph.D., and James Vasile, Esq.
If you have any questions about this event, please contact the event organizers.
For more information, visit the event website.