Some risk management policies (which contain restrictions and guidlines for alcolol consumption) vary from organization to organization. Locals depending on their goals, vary from the NPC, NPHC and IFC organizations. Up-n-comings, I'm not sure how they fall in the trends.

This is the information I pulled from NPC's website on policies. These are resolutions. These are only selected resolutions. Their website is: www.npcwomen.org

Your summary sounds pretty accurate. If a chapter rather then individual members are invited to parties were alcholol are server, typically the sorority will have some type of sober sister program established. Being that i'm not in an NPC sorority you'll have to verify the accuracy, but I believe they can have parties at a venue site were a third party can provide alcolol as in a cash bar setting.

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1998--Alcohol-Free Social Activities
That the NPC member fraternities will continue to support the efforts toward alcohol-free housing in men's facilities with the goal being that the individual NPC member fraternities will work toward co-sponsoring only alcohol-free functions in men's fraternity facilities by the fall term of 2000.

1997 --Alcohol-Free Facility
Member groups will encourage their collegiate chapters to co-host non-alcoholic events with men's fraternities that have implemented a substance-free housing policy. NPC member groups will publicize their support for the substance-free housing movement and encourage other national fraternities to join this important initiative.