I attended the Tibetan Freedom Fest (which Yauch helped create and promote) on Randall's Island in NYC back in 1997. The Beastie Boys headlined, and it was a memorable event.
Check out this lineup, via Wikipedia:
Downing Stadium, Randall's Island June 7 & 8 1997 $250,000 raised Over 50,000 Attendees,Damn, but they don't have shows like that very often anymore! RIP Adam Yauch. He will be missed.
Noel Gallagher, Foo Fighters, U2, Sonic Youth, Biz Markie, Alanis Morissette, Patti Smith, The Jon Spencer Blues Explosion, Radiohead, Yungchen Lhamo, Ben Harper & The Innocent Criminals, A Tribe Called Quest, Beastie Boys, Rancid, Björk, Pavement, Blur, Michael Stipe & Mike Mills, Taj Mahal and Phantom Blues Band, De La Soul, Dadon, Chaksam-pa, Nawang Khechog, The Mighty Mighty Bosstones, Eddie Vedder & Mike McCready, KRS-ONE, Porno for Pyros, and Lee Perry featuring Mad Professor & the Robotiks Band