Son's high school team has played the Mingo Bay Tourny in Myrtle Beach, Halahan Tournament near Charleston, SC, and Hard 9 in Anaheim, CA. This year - NC. In my experience, I had to Google the dates and the teams were not posted until the schedule was set, several days before. The Hard 9 teams, however, were announced months in advance.
I have also heard of tournaments in the Virginia Beach area and in the Richmond metro area that are sponsored by a high school.
Some school teams don't announce if/what they are doing for spring break until the roster is set in Feb.