Some of the clubs in MD have already finished tryouts. But others are still open. All of these offer 25 club teams, as far as I'm aware:

Bethesda (DC Express) https://www.bethesdalacrosse.org/boys-tryouts
Blue Claws: http://www.blueclawslax.leag1.com/
Cannons: http://www.cannonsselect.com/
Crabs: https://crabslax.com/ContentGeneral.aspx?ContentKey=TryoutsCrabs
FCA: https://fcamdlax.org/boys/about/tryouts/
Hawks: https://www.annapolishawks.com/tryouts
Koopers: https://www.kooperslacrosse.com/
Next Level: https://nextlevelspartans.com/
Preds: https://predatorslacrosse.com/maryland/
Rock: https://www.rocklacrosse.net/page/show/3739945-rock-high-school-program
Rockfish: https://www.rockfishlax.com/tryouts/
Saltwater: https://saltwaterlax.com/upcoming-events/boys-tryouts-open-now/
Team 91: https://maryland.team91lacrosse.com/tryouts/
Team Lacrosse: http://www.teamlacrosseclub.com/events/2436567-2021-22-fall---summer-tryouts
Zingos: https://www.zingoslacrosse.com/Default.aspx?tabid=1347030