The five day long event has been held each year since 1939 with the exception of four years during World War II.  

The Masquerade (another highlight of the program) is spectacular, as the costumers prepare their best work for this event. There are concerts and artists' and writers' workshops. The film program will usually include the Hugo-nominated Best Dramatic Presentations. Major TV and film studios will often preview their new work at the Worldcon. Worldcon attendees were the first to find out about Star Trek, Star Wars, and many others.