Here's a handy list of all classes under $10 coming up in May + June 2017:
The Archaeology of Cats and Dogs: Wednesday, May 10 in Prospect Heights
Opera 101: Thursday, May 11 in Prospect Heights
The Sumerians: History's Innovators: Thursday, May 18 in Prospect Heights
Thoreau's Wildflowers + Thoreau's Animals: Thursday, June 1 in Prospect Heights
Graffiti: Its History and Metamorphosis: Monday, June 5 in Prospect Heights
Life in Medieval Baghdad: Monday, June 5 in Prospect Heights
Nothing Dark about the Dark Ages: Tuesday, June 6 in Windsor Terrace
The Sugar and Coffee War: Wednesday, June 7 in Prospect Heights
Parks, Planning and Power: Wednesday, June 7 in Prospect Heights