box social

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A fund-raising event in which donated box lunches are auctioned off.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun US A fundraising event in which boxes are decorated and filled with meals for two (traditionally by women) and others (traditionally men) bid on them, anticipating a meal with the preparer.
• noun UK, historical A Victorian social event for young people.