This is a first release of xPLGCal. This app scans your Google Calendars every 15 minutes and sends an osd.basic message if an event is starting within 15 minutes. It will check up to 4 calendars. To use it, just create a config.txt file specifying a name and an associated Google Calendar "magic cookie." There's no need to explicitly store the Google password using this method. Here's how to find your GCal magic cookie. Make sure to replace 'basic' with 'full' on the magic cookie URL.
Your config.txt file contains a single line and goes in the same directory as the binary and will look like this with two users (John and Jane):
Now, just fire it up...