I actually did find some availability for economy BOS-DUB and I found them June 21st - July 7th which works for us. We would have to fly Southwest to BOS, but it's not the end of the world for us. I even found a few United Saver awards DEN-BOS but with really long transit times of 7+ hours. No availability at all on the return BOS-DEN though. No availability for DEN-ORD either for any of our dates. We could always do one way awards going to BOS and just have them interline our bags to DUB. Ughh, this is so frustrating! I was even looking at flights direct DEN-ORD all the way in August and nothing is available. Does United hold back awards or are they really all snatched up that fast?