Long time member / supporter / donator of Longwood Gardens here… it’s a wonderful place to visit if able - while their Christmas display is well known - I personally prefer spring / early fall to be able to more easily walk around outside / when the fountains are open.

When they have larger bonsai displays they have been some of the best I have seen anywhere.

The Philadelphia Flower show recently had a bonsai display. I also know there is a bonsai focused garden somewhere near Philadelphia that I have yet to make it to.

As someone who has tried to grow bonsai and never quite succeeded - I always find them enthralling.