First presentation of PAL (short for Phase Alternating Line), the color encoding system for analogue television.
Day of death of the British fashion designer Lee Alexander McQueen.
Premiere of the Hitchcock movie "The Birds".
Voodoo is legally recognized as a religion in Haiti. Priests and priestesses now have same rights as their Catholic counterparts. They may officially perform marriages, conduct baptisms and lead funerals.
Wikipedia: 4. April
60th Birthday of Irish actor and film producer Pierce Brosnan.