We're signed up to be at this, and so are Clanconnell, but that's all the breweries I know of. It's a bottled beer festival and there will be lots of non-Irish beer there as well, along with Bluegrass music and food. Ruth seems to have put a lot of work into organising it and I know a lot of tickets have been sold already.
Actually, I've just seen that there is a Facebook page that gives a lot more information [url:2zce126o]http://www.facebook.com/pages/Deveneys-Dundrum-Lughnasa-Beer-Festival-August-2010/125134090837601[/url:2zce126o]
Other Irish breweries appear to be Carlow, Whitewater and Hilden.