Fêtes et traditions françaises - site with a list of holidays with brief explanations of each. Great for beginners as the sentences are short. Suggestion: you can have each student (or pairs of students) read each a passage and explain the holidays to others.
Bastille Day - Lawless French Reading Comprehension - 14 July
Read about the French Holiday, Bastille Day. The article has an English translation as well to check comprehension, but try reading without it to see what similarities Bastille Day has with an American holiday.
(not unit, but related French): Students learn about carnival in Quebec, how it differs from the celebration of carnival in other nations. Use carnival as an exemplar for study (should we celebrate it, parts of celebration, origin, who celebrates, etc.)