best food stops between BR and Vicksburg?

You might be surprised. The ceremony likely won't last more than 15 minutes( the way God intended) and if the families are as many in the Delta, the party will last well into the night.
Old Lorman Store is known for chicken. Walnut Hills in Vicksburg is a treat ( sit at a round table and come hungry). Lunch at the Carriage House in Natchez is also very nice.
Roux 61 south of Natchez is pretty good (sort of like a redneck Sammy's).