Event:
Tens of thousands of people demonstrate in Tahrir Square against continuing military rule in Egypt
More Notable Events on April 20:
1996 Chicago Bulls win record 72 games in a season
1992 Madonna signs $60-million deal with Time Warner
1983 President Reagan signs a $165B bail out for Social Security
1977 Woody Allen's film "Annie Hall" premieres
1971 U.S. Supreme Court upholds use of busing to achieve racial desegregation
