My daughter is grown up now, but she wore a costume to work and went to a haloween party in the evening, I think they had alcohol instead of sweets (candy) though. It's good to know that everyone can join in no matter how old they are.
I am so sorry to hear your husband put the dampers on the fun, and is going to report you. He is obviously scared the kids will die at Armaggedon. What he is proposing to do is terrible, but don't forget he thinks it is what's best for your whole family. Just try and ignore the elders but show your husband love, and that you are a good wife and mother. Very sorry this is happening, WT is a cult.
Kate xx