One such event is the Civil Rights Act, that landmark piece of legislation that finally made it illegal to openly discriminate against black people and women.
Of course, if you could get creative and indirect in your discrimination of these minorities, then that's a completely different story. Then, you're a creative person who should be allowed to freely express that racist creativity in novel, interesting, inconspicuous and unexpected ways. Can I get an Amen?! :)
Why not check the Martin Luther King, Jr. tag while you're here?