March weekend when 68 college-hoops dreams are stamped or shattered

This clue leads to Selection Sunday. The sections below explain what it refers to, why it matches the clue, and why it may be appearing in the current trend cycle.

The selection process for college basketball's NCAA Division I Men's and Women's Basketball Tournaments determine which teams will enter the tournaments and their seedings and matchups in the knockout bracket. Currently, thirty-one (31) teams gain automatic entry through winning their conference's championship. The remaining teams rely on the selection committee to award them an at-large bid in the tournament. The selection process primarily takes place on Selection Sunday and the days leading up to it. Selection Sunday is also when the men's brackets and seeds are released to the public. Beginning in 2022, the women's championship brackets and seeds are also announced on Sunday. Prior to the expansion of the bracket from 64 to 68 teams the women's championship brackets and seeds were announced one day later, on Selection Monday.

Background summary sourced from Wikipedia (CC BY-SA). View source

The NCAA Division I Men’s and Women’s Basketball Tournament fields are revealed on the Sunday before the tournaments begin, an event universally known as Selection Sunday.