Come for the show, bring the little one to the kids workshop and they can take home their very own bonsai, bring a tree your stuck on to the clinic/workshop, take a stroll though the art gallery or Japanese garden and enjoy some fine coffee-yes that's all at the one show! Not to mention great trees, friendly people and a great raffle prize. Free parking.
Here's the details:

Well worth the short trip down (or up) the M5