You can find out more about this on Facebook also. This news below comes from the West Palm Beat blog:
A hurricane awareness and preparedness event is set for 11 a.m. to 2
p.m. Saturday, June 17, at the mass grave for victims of the 1928 Okeechobee Hurricane.
The grave is part of a city memorial and park at Twenty-Fifth Street and Tamarind Avenue in West Palm Beach.
It is believed to hold as many as 700 victims of the storm, which
killed up to 3,000 in Palm Beach County, making it the state’s greatest
natural disaster and likely the second deadliest natural disaster in
U.S. history, behind the 1900 Galveston, Texas, storm.
Call 561-881-8298 for more information.
To learn more Jeff Klinkenberg at the Tampa Bay Times has this article titled, "Unmarked but not unmourned, 1928 Hurricane's victims get memorial 80 years later".