Round 5.
Belle Isle Detroit.
Race start 12:00hrs ET/17:00hrs BST Saturday 30th May.
You can watch it here
http://www.imsa.com/camera/imsatvor on Motors TV (Freeview channel 71).
The GTLM class aren't here because several teams will be at 24hrs Le Mans Test at La Sarthe tomorrow Sunday 31st May.
Yes, I also missed posting Round 4 at Laguna Seca. But I
was at Spa enjoying Round 2 of WEC!
You can watch a re-run here
http://www.imsa.com/imsa-tv/episode/2015-continental-tire-monterey-grand-prix-powered-mazda-race-broadcastand it's worth a watch too. Such an iconic race-track.