These sets were inspired by the book "What to wear, where - the how-to handbook for any style situation" by Hillary Kerr & Katherine Power. As an experiment I'll try to make a set for each of the occasions listed in this book:
 
Art gallery
Barbecue
Beach
Benefit
Birthday party
Bowling
Cocktail party - corporate
Cocktail party - festive
Cold weather
Concert
Country club
Courtroom
Date - casual
Date - first
Dinner party
Dog park
Engagement party
Errands
Farmers market
Fashion event
Game night
Girls' night out
Graduation
Job interview - conservative
Job interview - creative
Kids' event
Ladies' luncheon
Meet the parents
Music festival
New Year's Eve
On camera
Opera
Picnic
Polo & horse races
Rain
Religious occasion - day
Religious occasion - night
Reunion - family
Reunion - school
Road trip
Shopping
Sightseeing
Somber occasion
Sporting event
Theater
Traveling
Wedding - black-tie
Wedding - cocktail
Wedding - daytime
Weekend