Editor's pick|A festival dedicated to new circus, Letní Letná is now in its 20th year. New circus relies on acrobatics and physical theater, without the use of trained animals. Czech and international groups will stage shows in circus tents and outdoors in Letná Park. Most of the shows are nonverbal and family-friendly, with the exception of some fairy tales aimed at young viewers. Runs Aug. 17–Sept. 3.