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="alignone size-full wp-image-4486" /></a>

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