score:37

Accepted answer
var query = mydatacontext.chaptermeeting
  .groupby(cm => cm.chapterid)
  .select(g => new {
      g.key,
      minmeetingdate = g.min(cm => cm.meetingdate)
  });

score:16

well, amy beat me to it, but in case you wanted to see it with the "comprehension" syntax:

var q = (
    from cm in context.chaptermeeting
    group cm by cm.chapterid into cmg
    select new {
        chapterid = cmg.key,
        firstmeetingdate = cmg.min(cm => cm.meetingdate)});

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