Can I work with Zulu enabled calendars on Android phones & tablets?
Yes. You have two options here.
1. The native calendar ap on Android will talk to Google Calendar, so you can use Zulu to sync with Google Calendar and then add those Google Calendars to your phone.
2. A few of our customers are having great success using AnDal to access their FileMaker Calendars on Android phones. AnDal is a CalDAV client for Android that works with Zulu enabled calendars on FileMaker Server. Enjoy!