There has been a lot of discussion in regards to athlete "at-large bids" for Regionals with District Entries due on Saturday night 4/19. The key to remember is that an athlete must run at Districts in an event in order to be able to use an at-large bid. (They must obtain a Time or a Mark) See (6) below.
Section 4.14.2.2.4 Advancement of Teams and Individuals under (a) (2) details "AT-Large Bids".
"(2) The next eight (8) best marks established at sanctioned qualifying meets during the regular season in each region not automatically qualifying by place at the district meet in each event will qualify for the region meet. District meets may also be considered qualifying meets provided the meet is sanctioned and meets all requirements thereof. These qualifiers will be known as "at-large bids.
(a) The at-large qualifying bids, once announced, are final."
Note: (6)
TFRRS Regional Sanctioned Meet Rankings (It is not ACTIVE yet, but is supposed to be made live on Monday.) There should be a "Sanctioned Meet Rankings" for each Region that can be selected.