St. Louis is not just the place to be for the U.S. Championship; there are other big-time events going on there as well. Coming up in exactly two weeks (May 16) are a pair of matches featuring their resident GMs, Hikaru Nakamura and Ben Finegold. Nakamura (currently #8 in the world) will take on former FIDE k.o. champ (and current world #11) Ruslan Ponomariov while Finegold takes on the legendary Viktor Korchnoi.
Both are 10-game matches, consisting first of six games with a "classical" time control followed by four rapid contests. More info here.