Running a party
For most parties, we prefer to arrive at the start of the party and paint guests as they arrive. Then if we are doing balloons we will do that after we have finished painting. For busy parties or when you want the guests to participate in a game, we will usually number the children so they know they won't miss out on their turn.
After we have finished up with the painting and balloons that is a good time to do the birthday cake and we can pack up and leave while the kids are all busy eating cake.
Simple Party Games
Pass the parcel - if you don't want to wrap up every layer try "Pass the Present" where you have a box with all the prizes in and when the music stops the child with the present gets to choose one out.
Pinata - always popular. For little kids there are the ribbon varieties where instead of hitting the pinata they pull ribbons until it opens. Or you can make your own with paper mache. Please do not use blindfolds as this always seems to end with someone getting hit. It can also be a good idea to have a selection of different "sticks" hitting the pinata - lightweight one to start off with to make sure everyone gets a turn, and then a heavier stick to make sure you can actually break the pinata.
Pin the tail on the donkey - variations of this are available with stickers from supermarkets/$2 shops. Or you could print off a picture to match the theme of your party and just use bluetack to stick the horn on the unicorn, the wand on the fairy, the sword on the ninja...
Musical chairs - or if you don't have enough chairs you can use cushions, or even just pieces of paper for musical spots etc.
Musical statues - they can either "freeze", or to make it easier to see you can have them sit down when the music stops.