Prague Information Service
This site offers quite an exhaustive listing of events in Prague in English, German, French, Spanish, Italian and Czech, as well as other services. Not as easy to use as the other sites above, but it does address a broader audience.
English language site for people living in Prague:
categorised bulletin board, public discussion forum,
reviews, news links, useful information and loads more.
Need tickets for the movies, theater or a concert? You can order one online at Ticketpro. If you're not sure what you're looking for, you can search by date, type of event, or venue.
Ergis - All about Krkonose Mts
This official site for Krkonose region offers detailed events calendar listing festivals, concerts, theatre plays, art exhibitions, cinema movies, dances, sport events, lectures, as well as sightseeing, tours, accommodation etc. All information is in Czech, English, German and Polish language.