Log in and go to google calendars.  Your name appears in a box entitled "my calendars" on the left.  Click on the arrow to the right of your name, then on "share this calendar."  You can click a box to share with everyone within the LCF domain (and set the level of sharing).  Below, you can also specify  individuals with whom to share.  You can share with anyone with a google calendar account (including those outside the LCF domain), and possible others (I haven't tried that).