He's 3.9 and has some sensory problems we're waiting to see the paedrician about but basically if things are too noisy, bright or crowded he gets overloaded and can have big meltdowns. The party is at a loud soft play place. He wants to go, I think he should go but cna't decide whether I should explain to the mum in advance that he might not cope or wing it and hope for the best.