A Hallowe'en Party

Each year it happens the same, ten will go, none will remain.

The reason I know is not out of guess. Once I went, it was quite fancy dress.

There were ghosts, vampires, fairies would go. None returned as you already know.

Then came me, dressed up as Myself. I scared enough children to go to hell.

Then came the host, he shot them all dead. Then there was me and to be honest he fled.

Now this evening I must return the same. I'll take over the party, play the same game.