The 13th International Short Film Festival Winterthur is currently calling for entries and the deadline is 31st July. You can either send off your entry by post or try an upload using Reelport. Actually Reelport is a better idea then Without a Box or even the Film Depot because Reelport allows you to store your film on their sever until you come across an appropriate festival of which you would like to send off your film. I get that impression anyhow.
Submission information may be gleaned at here. Don't forget to label your packages with "Used video tape / used film print. For cultural purposes only. No commercial value." There is no entry fee required to submit your film to the Kurzfilmtage Winterthur. This is Switzerland's largest short film festival, held in Winterthur (A Northern Swiss canton of Zurich) a city that was once called by the Romans Vitudurum. I don't know what the word exactly means but perhaps something to do with Roman camps.
Below is a picturesque photo of the city of Winterthur.