Can I share a subscribed calendar with someone who is not a subscriber?

I get assigned game times & locations in an online system. When I'm logged in, the system shows me a calendar of my assignments. I subscribe to that calendar, so I see my assignments on my phone in Calendar.

I need others in my family to see when I'm occupied and where I will be, but they cannot get into the system and even if they could they couldn't see my calendar or subscribe to it.

Anyone know of a way to share the calendar feed I receive from the assigning system with my family so they can see my assignments? (other than re-entering everything by hand)