Depends on how large the space is. I’ve played my 100 at an outdoor patio with seating for maybe 50; 100 was fine. I’ve played bigger lawns for 500, but 100 was into the PA. I was very glad I had the PA line. Granted, this was with electric guitar and mic’ed cajon, so you may be able to get by with less.
I also have a second Rumble 100. Hooked them both together for a smallish outdoor gig, with full drums, no PA line. Sounded great on stage, sound guy confirmed. So you could always get one, if it’s not enough get a second! 2x100 beats 200 in watts, surface area, and overall impressive looks.