This year's line-up of speakers is fabulous and well worth registering for.  Arne Maynard is one of my favorite UK gardens designers - his talk on the Ever Evolving Garden is based on his own garden - Alt-y-bela.  One I've always wanted to visit  

I'm also looking forward to Jonathon Alderson's talk on Ecological Design in Practice.

http://www.perennialplantconference.org
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From 9:3--noon.  This year the keynote speaker is W. Gary Smith, an artist and landscape
designer who specializes in botanical gardens and arboretums, as well as
public art installations and private gardens.