Unfortunately the answer to all of your questions is no!
Trouble brewing run an annual (I've said it so now it must become true) homebrew competition but other than that there is nothing at the moment, there was talk on her about a homebrew competition at one stage or another but it has not yet materialised.
I would love to see more competitions but unfortunately there are none <!-- s:( --><img src="{SMILIES_PATH}/icon_sad.gif" alt="

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I'd also love to have an Irish equivalent of the BJCP because though I know we are useless when it comes to runnign things I think we'd be less BJCP about things then they are.