Million Marijuana March, now known as Global Marijuana March and Worldwide Marijuana March, was the Fifth Avenue Pot Parade expanded worldwide by Dana Beal and Cures-Not-Wars. May 2, 1998 was "Phase 1" with no other known cities (yet) except New York City.
The Howard Stern Show on November 19, 1998 - Goofing on the 1998 Million Marijuana March that occurred on May 2, 1998 in New York City. Dana Beal calls in to the show at 9 minutes 9 seconds in. Howard, Dana and the crew also discuss the upcoming 1999 MMM on May 1, 1999, and that it will occur in various cities worldwide. YouTube link.