As mentioned by the EuroTechEvents.net, there's a Yahoo! Developer Network event coming up in the UK (London) covering PHP, oAuth and Web Services.
YDN Tuesdays are a way to meet and hear technical presentations from Yahoo experts for free. They will be held on the first Tuesday of every month throughout 2009. YDN Tuesdays will kick of with James Broad discussing PHP, oAuth & Web Services.