Years ago, a company named Two Dragons (possibly now owned by Caliver?) did British Revolutionary/Consular War figures in 15mm; Chariot Miniatures do, or did, a Parisian "sans culottes" mob; and Minifigs do a French Revolutionary range with British and French in bicorne, as well as pirates and civlians in their Renaissance range. Khurusan also do some 1798 Irish Rebellion figures that would be perfect as well-dressed armed and unarmed civilians.
If you can disguise/remove the more modern weaponry, look at some of the late 19th Century Spanish/Cuban ranges for peasantry etc.