8:30 a.m. to 3:30 p.m. Brookhaven National Laboratory hosts workshop on the status of biodiesel in the U.S.; Brookhaven National Laboratory, William Floyd Parkway, Upton.
9 a.m. The World Trade Centers Association holds 2nd Annual Peace and Stability Through Trade Conference; Dag Hammarskjold Library Auditorium at the United Nations.
10 a.m. Board of Directors meeting for the Harlem Community Development Corporation; Harlem Community Development Corporation, 163 West 125th St., 17th Floor Conference Room.
11 a.m. National Puerto Rican Day Parade announces Grand Marshal; Cherkasky-Davis Conference Center at 1199 SEIU Headquarters, 330 West 42nd St.
11 a.m. Assemblyman Steven Cymbrowitz presents Assembly Resolution proclaiming May 1 as Holocaust Remembrance Day to the Simon Wiesenthal Center; 50 East 42nd St., 16th Floor.
12:30 p.m. Council Members meet with seniors to discuss impending modernization of the Department for the Aging; Grace Agard Harewood Senior Center, 966 Fulton St., between Grand Avenue and St. James Place.
1 p.m. Rep. Nydia Velazquez announces funding for a new health education initiative for Brooklyn youth; El Puente Center for Arts & Culture, 211 South 4th St., Brooklyn.
7 p.m. Reps. Gregory Meeks hosts Town Hall meeting of Postal Service issues; Far Rockaway High School, 8021 Beach 25th St., Far Rockaway, Queens.
8 p.m. Radio City Music Hall Speaker Series featuring former Vice President Al Gore.