I decided I did indeed dare to make a long dress for the summer. After I posted about my debate I was invited to another wedding and I thought, “Perfect! Two out of the three times I’ll ever wear this are covered!”
What fabric am I using? Um, maybe some Liberty of London (from a new source). The pattern is a Cynthia Rowley and I don’t have the best track record with her, but I mocked up the bodice before I cut into the good fabric, never fear. 
I have 1.5 weeks until wedding #1 so I’m happy for a day off tomorrow. Time to get sewing!