From the USFS press release linked in post #1:
The U.S. Adult Championships have been held annually since 1994. Events are held in singles, pairs and ice dance, and in dramatic and light entertainment. Athletes qualify for championship events by placing in the top four at one of three sectional championships held March 9-11, 2018.
2018 U.S. Adult Qualifying Season
Eastern Adult Sectional
Ardmore, Pennsylvania
March 9-11, 2018
Philadelphia Skating Club & Humane Society
Pacific Coast Adult Sectional
Pasadena, California
March 9-11, 2018
Pasadena Figure Skating Club
Midwestern
Rochester, Michigan
March 9-11, 2018
ONYX-Suburban Skating Academy
U.S. Adult Championships
Hyannis, Massachusetts
April 10-14, 2018
Yarmouth Ice Club