There is a flurry of activity in a number of countries to celebrate Pete's 90th birthday this year

I have started a list of Australian concerts and events at

http://unionsong.com/seeger90.html

I see that Singout! is putting together a list of US events starting with

The Clearwater Concert:
Creating the Next Generation of Environmental Leaders, a star-studded, one night only concert event celebrating Pete Seeger's 90th Birthday, will be held on Sunday, May 3, at 7PM, at Madison Square Garden.