Circus Bella has been a fixture in Bay Area street performance for years — this isn't a promo table with branded stress balls, it's working circus artists running an actual skills clinic. Juggling instruction at this level usually costs money; here it doesn't. Bring whatever curiosity you have and expect to look foolish for the first ten minutes regardless of coordination level.

Practical note: Union Square is open but the immediate plaza furniture shifts around depending on what's set up that week. Come in from the Powell Street side for the clearest sight lines to where a workshop would logically stage. Parking in the area is expensive and slow; BART is the correct answer here.

If you have two hours: show up, learn the three-ball cascade or die trying, then walk to the Ferry Building and call it a Saturday.