I’ve just made up a simple Astronomy Calendar containing the celestial events from 2010, August according to www.seasky.org.
It is a Google Calendar so you can simply add it by ID:
in your Google Calendar on the left side, bottom hit Add > Add a friend’s calendar, paste the ID here.
You can view it as HTML here: http://www.google.com/calendar/embed?src=nhsv6ru3irspm1305gthlmf938%40group.calendar.google.com&ctz=Europe/Prague.
I’ll keep this calendar up-to-date so if you want to embed it just drop me an email.