As I mentioned before, in direct violation of the Geneva Convention, Subsection: Hispanic Party Regulations, I did NOT serve alcohol at my child's 3rd birthday party, nor did I hire a DJ or mariachis or even rent a moonwalk. Paying for music and a giant inflatable castle just wasn't financially feasible this year, and even if it were, I don't think I would have bothered. That's NOT how I roll. As far as not buying beer for any of my guests, I know, Manny, disgraceful to my people, but since I was raised by an alcoholic who made every holiday and occasion hell with the addition of beer or spirits available to everyone, I have refrained from inflicting the same shame upon my own daughters.
Slouchmonkey, since you're taking notes, I'll answer you as well: No, postponement doesn't really happen with a kids party, not when there's only one day when everyone who can help you is off work and so many things have to be ordered/prepared in advance, like food, the cake (which does not count as the food), 50 lbs of ice, etc., not to mention prearranged entertainment or sno-cone machine/popcorn machine/table and chair rentals. (Tangent: Do you know that you can actually hire a girl to come to your child's party dressed as a non-slutty Princess Jasmine and have her do little crafts and games with the children? This is not even the most over-the-top thing I've seen at middle class parties.)
To be fair, I wasn't expecting quite so many adults at a kid party (some of my relatives dropped in uninvited, but since they brought gifts I let it go), and I had initially planned to have everyone outside so the kids could play in the sprinklers and toss water balloons at each other. But I'll tell you one word that saved my living room from a massive pinata beatdown: CARPORT. That has saved many parties from being exclusively indoor affairs. Once the rain is not quite so torrential, a carport is your best friend. If you don't have one, then for God's sake, have a clean garage people can hang out in, preferably with a beam or hook in the center of the ceiling from which to hang that pinata.
One activity I wish we'd been able to do was Smoke Egg War. Basically, you take empty egg shells (1 inch hole on the top, washed, dried, and saved up in advance) and fill them with flour, then cover the holes with tape and crepe paper. Yes, just like Confetti Eggs, only messier. Outside, you throw the eggs on the ground (or crack them on someone's head) and let the flour get picked up by the wind and make a fake smoke. Nobody really wins, but everyone has a good time. I was looking forward to this activity, but Bizarro Dad warned me that even if it hadn't rained, Smoke Eggs + Sprinklers = T0rtillas All Over the Front Yard.
*sigh* I never get to have any fun.