According to The Full 90, the city blog for Sporting KC, the date for the NUFC visit has been set at July 20.
Sporting Kansas City will host English Premier League side Newcastle United F.C. on Wednesday, July 20th at Livestrong Sporting Park. The match will be included in all Kansas City season ticket packages.
Make extra sure you drop by The Full 90 and read the whole story, and start making travel arrangements! I still seems likely that this will be a single stop on a North American tour for NUFC, so stay tuned in for news.