NYSPHSAA REGULATION - PRACTICE SESSIONS:
a. An organized practice in grades 7-12 is a session for the purpose of providing instruction and practice in physical conditioning activities, skills, team play, and game strategy designed expressly for that sport under the supervision of a qualified coach appointed by the Board of Education of the local school district. Such instruction and practice shall be held only during the season designated for that sport.

It clearly states that an organized practice ......shall only be held only during the season designated for that sport so a coach can only hold practices on or after March 9th for Lacrosse. Anything else is clearly not permitted.