There are so many websites that publish upcoming news events e.g. Forex Factory, Daily Forex etc.
There is another website http://www.forexrazor.com/en-us/calendar.aspx - this publishes a rating of the probable impact of news events on the forex market. I can't vouch for its accuracy, I don't give a whole lot of weight to it when it comes to trading strategy, but I do find it a valuable steer nonetheless.
I guess that makes me a Tesco trader: every little helps!
I'd suggest wbponline.. But they are selective focusing on the most important stuff and more inclined to the US.... Twitter, if you have the right list to follow also gives you the info but as quick...