By using CalDav, as explained here http://wiki.meego.com/Migrating_from...ogle_Calendars I synced my primary (my own) calendar with MfE, but all additional calendars with https://www.google.com/calendar/dav/username/ (Using the other person's Google username worked for me, didn't even have to do the uuid@group.calendar.google.com bit that the wiki page mentions).