Thank you all for your advice. I know it's not easy to help another parent as all children are different and some things work for one and not another.
Fortunately, Eli did shape up and was able to have his party tonight. Luckily for us, only 3 of the 5 invited were able to make it and only 1 was able to spend the night. whew! Seven boys under the age of 12 in one small home is quite a riot.
I still don't know what got into him this week. There are times when you know your kid is acting out to show off or because they are tired. Oddly enough, Eli was the first up each morning this week (definitely not the norm)so we didn't think him being tired was the issue. I'm sure I'll never know what it was (though it bled over into his school behavior as well).
Now, if only we could get through to Michael. He's grounded into the middle of February. Aye, carumba!
PS. My plans for tomorrow: making caramel sweet rolls, reading more Anna Karenina, and posting pics from Eli's party. Sweet!