Do laundry everyday regardless of having a party or not. I do 2-3 loads a day and fold & put away.
I even stick a load in the wash before or after church, I don't fold and it greets me bright & early Monday morning!
Having piles of laundry the day of a party is no fun and it just feels better keeping it up.
*Realize that only a fraction of your ideas will come to fruition. Unless you have a small army on hand to cut, stamp and assemble it isn't going to happen. Be ok with it.....simple is more. If you do a highly detailed event give yourself 3 months ahead or more if you have small children.
*Do the grocery shopping 2 days before this is important. I can tell you I have waited until the day of and it's not pretty.
*Check weather and always have a backup plan. Since no rain is in sight I went ahead and set up my areas. It's going to be hot, hot, hot so for Friday evening so we moved the dinner to 7:30.