Rebel Organizer 1.0.3
Simple and easy to use events organizer for Linux
You can even keep contact list and link people or companies from that list to events and all of this with amazing ease. This software is free and available for Windows and Linux. Just create some folder and unpack content of downloaded archive into it.
Create shortcut on your desktop in case of Windows or launcher in case of Linux and you're good to go. Now Unicode UTF-8 supported, you can use all your language characters for text fields.