Indoor turf – in fact any sort of indoor activities center that can be used year-round – is a trend that’s late coming to Grand Forks. A number of regional cities and entities have understood the importance of indoor facilities, not only as a place for local athletes to practice but also as a destination for wintertime activities. Sioux Falls, S.D., is a good example. That community has a number of indoor facilities available for use during the cold months. The city also has benefited greatly by making sports a tourist attraction. It’s considerably larger than Grand Forks – with a population of 177,000 – but smaller towns are doing…