for a way to let others know when and where you are? Use an online calendar!
Here are two I recommend:
has great "stickers" you can use - plus add your own. You
can also merge multiple calendars so everyone in the office or family
can have their own. You can have your organizations' calendars merged
with your personal calendar. Anyone can view your calendar, but you
need a password to change it. $14.95 per year.
is a simpler calendar which requires a password to log in and view it.
Fewer functions than SuperCalendar - but it's free.