Hi, I just wanted to share something useful I’ve discovered regarding using external calendar subscriptions with Android devices.
At the moment, you can subscribe to the calendar via a Google account. However, it can take up to 12 hours to sync and there’s no way to manually refresh.
I’ve discovered a free app on Android called OneCalendar - https://play.google.com/store/apps/details?id=biz.codespark.xcalendarapp&hl=en_US&gl=US - where you can add a subscription calendar (Menu → Accounts → Add Account → WebCal → paste calendar url). Whilst it does still seem to take up to 12 hours to automatically sync, there is a way to manually force-sync (Menu → Sync), which is a viable solution to the problem.
Hope this helps someone else.