Since you both have Droids, I will assume that you are using Google calander and are syncing with Google.
If this is the case, yes, you can have your husband sync both yours and his calander on his phone.
From your computer, go into your husbands Gmail, and open Google calendar. On the left side of your screen, you will see "Other Calendars". Under this, click "add" > "add a friends calendar" and type in your gmail address. This should help you add your calendar info to your husbands droid.
Thank You. It worked like a charm!