The North American class committee has approved a list of regattas that are officially "Class Sanctioned" per the Class Bylaws (see https://www.viper640.org/class/constitution-bylaws/).
For reference the entire list is attached. Future events include:
Atlantic Coast Championship, Charleston, SC Apr 12-14
Gulf Coast Championship, Mandeville, LA Apr 27-28
Mid-Atlantic Championship, Annapolis, MD May 18-19
Canadian Open Championship, Nepean, ON Jun 15-16
Long Beach Race Week, Long Beach, CA June 21-23
New England Championship, Marblehead, MA Jun 29-30
Pacific Coast Championship, Santa Barbara, CA Aug 10-11
North American Championship Long Beach, CA Aug 19-24
Viper 640 World Championship Long Beach, CA Aug 19-24
Sarasota Winter Series 2019-2020 Sarasota, FL Dec 14-15