@Ceili,
Halloween was my second choice, but I'm no longer a kid, my kids have grown, and I don't yet have grandchildren.
I do long to dress up in a costume every Halloween though. My wife's something of an introvert and won't let me have a costume party or won't join me in attending one.
I've promised myself that if I ever win hundreds of millions in a lottery, I will host a costume party and invite at least 200 people. I'll also send $500 with every invitation to be used on a first class costume.
Still not sure what I'll wear but I'm thinking Louis the 14th, Edwardian England, or sci-fi tribal.