Q&A:
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What the hell ? : First, thank you for this great question. The Roller Games are the first roller sports games organized by the roller sports federation also known as the "Fédération internationale de Roller Sports", pardon my french). During these games, 110 events from 10 disciplines will be show off during 15 days. 4,000 athletes are expected.
Nanjing, like in Nanjing, China ? : Yes, very good ! Not exactly your roller sports mecca, the city was initially chosen to host the second Roller Games in 2019, but after the withdraw of Barcelona in early 2016, both cities switch places making Nanjing the host city of these inaugural games.
So what are the sports ? : Immagine the Winter Olympic Games but without the snow and the ice ? Excited yet ? No ? well, you should, because that is exactly what you're going to get: Artistic, Alpine, Speed, Hockey (x2 !)...
Wait...two hockeys ? : Yes ! One is played on classic quad skates, when the second one is played on inline skates (pro tip: don't mention the existence of the other hockey to the other group).
Rink Hockey, Artistic and Roller Rerby are played on quad skates; Alpine, Downhill, Freestyle, Inline Hockey and Speed are played on inline skates; and finally skateboarding is played... well, on skateboards.
No rollerball then ? I'm affraid no. But you have Roller Derby (but yes, that's not the same without the explosions)
Why should I care? Because... it's on TV !. Ah forget about that, it probably won't be. Still, with 110 events, the odds are one of your countrymen is going to win one of these medals. And you like some random medals as much as the next guy, right ?
Any streams anywhere ? The federation actually has a pretty serviceable streaming service here. There is some hoping, we will be able to catch most of it.