Super Busy Week and Needing a Suggestion for Drinkable Soup

As you might guess, this week leading up to the graduation reception for my daughter is a busy one for me. We shifted the time of the reception from just an afternoon one to a later hour to accommodate some guests who are important to our family. This means that our gathering is crossing the dinner hour, and I want to include more substantial foods that can still be eaten while standing or off of a lap (no knives, finger foods are preferable). I've decided that in addition to serving small sandwiches and appetizers, I will serve a soup to be consumed from cups, ie. drinkable. The weather forecast suggests cool-ish temperatures, so a hot soup will work out fine. I'm looking for suggestions for a soup that does not require a spoon, but could be sipped from a cup -- no or minimal chunks in the liquid. In addition, I want the soup to be substantial enough to be filling. I could make it from scratch or partially from scratch the day before or the morning of. I'm all ears for suggestions!