Lots of synagogues print up a customized calendar every year. (Sample.) Such a calendar includes shul-specific information (e.g. service times and maybe a weekly class or two) and general information (e.g. Shabbat times and holiday dates).
They post a copy on the front door; they may also hang a copy in the hallway or mail copies to their members.
Creating a synagogue calendar manually is drudge work, and it's easy to include careless mistakes.
Is there any software which can help?