Should I . . .
a. Cancel our 8 p.m. appointment
b. Go to Elenor's house, let her open the bottle of Prosecco for herself, then request a cup of chamomile tea (which will make her self-conscious)
c. Warn her before she opens the bottle that I won't be imbibing so that she, too, will feel compelled to sip chamomile tea (which will make her all sad and dreary)
d. Have a polite glass of Prosecco and break my 90-day pledge -- but go back on the wagon tomorrow
e. Split the bottle of Prosecco with Elenor, buy a jug of Old Crow on the way home, and scrap the pledge