I don't think attending a showcase in February will serve you much purpose, unless you just want your son to experience that type of setting for down the road. Sounds like your son did have a rest period, which is imperative. If he's just starting to throw lightly now, I'm not sure he should be going to a showcase in a month. As Cabbage points out, he's going to feel pressured to through hard, risk injury, with very little outcome on the other end.