Looks like Grace Potter and the Nocturnals are scheduled to appear on the following dates:
<a href="http://www.thisissomewhere.com/wp-content/uploads/2010/03/lilith-fair.png"><img src="http://www.thisissomewhere.com/wp-content/uploads/2010/03/lilith-fair.png" alt="lilith-fair" title="lilith-fair" width="522" height="301" class="alignleft size-full wp-image-4486" /></a>

June 27 : Calgary, AB
June 28 : Edmonton, AB
July 1 : Vancouver, BC
July 2 : Portland, OR
July 3: Seattle, WA