Party help!!!!!!

We are having Stephen's party at our house. I am hoping it is dry weather so the kids can play in the sprinkler in the back yard. I could have up to 20 kids at our house! THis is more than last year, we have made some friends over the last year with kids and he invited a few buddies from school. Our house is not small, but not huge either. I need some ideas for games, indoor and outdoor. We have a pin the #1 on thomas the train but not other indoor games. We have the silly sprinkler for outsider and that is it. I need help LOL I am soooo not creative!

You are crazy! 20 kids!! We will only have cousins at our party. (probably 7 kids and the grown ups that they belong to.)

Kids this age love the fishing over the curtain for prizes. Tattoos. Balloon games. (maybe a water balloon toss) = a little high skill level for 3 year olds but funny nonetheless. My niece had a water gun fight in her backyard for her birthday party. Maybe a pinata with the pull strings instead of the bat

Do you have a kiddy pool??? I'm trying to decide if we're going to do the sprinkler and pool (maybe some water guns) at our house or if we're going to do a Dora adventure at the park or our house. Depending on the age of the kids you could have some balls out to play catch, sidewalk chalk for drawing, and bubbles.

(Sorry my quick search came up with alot)

Prize Walk Birthday Game
Have a birthday prize walk instead of a cakewalk. Place numbers on the ground in a circle or oval. Start the music and the birthday party kids walk around the circle until the music stops. Pick a number out of a hat or roll a dice to decide which number wins a prize. The child that is standing on the number that is picked gets to choose a small toy from the birthday games prize table.

Bean Bag Toss Game
Cut several circles out of a piece of cardboard, or a large box. Decorate the cardboard with things from your birthday party theme. Use beanbags or socks (filled with beans and tied) to throw into the holes. Give small prizes if they make it in the holes.
Pin the tail on the Donkey Games
Place a poster on the wall and put a piece of tape on the back of each object the children will be pinning on the poster. Blindfold children, spin them around, and point them toward the poster. The child who pins their object closest to the designated spot, is the winner! Tip: Use a poster from your birthday party theme for this game. Examples: Pin the spider on the web, tutu on the ballerina, nose on the clown, X on a treasure map etc.

Duck Pond Grab Game
Birthday party guests pick rubber ducks out of a wading pool - they win a prize according to the number on the bottom of the duck. Write the numbers 1 - 5 (repeat numbers according to how many ducks you have) on the bottom of the ducks and place in pool. In back of the pool have 5 baskets with different prizes and number the baskets 1 through 5. Party guests pick up a duck to see what number is on the bottom then win the prize that corresponds to that number. If the birthday party guest picks up a duck with a number 4 on the bottom, they get a prize from the number 4 basket. It’s a simple game, but children love it! Tip: Instead of ducks use floating objects that relate to your birthday party theme. The more ducks the better - give them away as favors after the birthday party.

Bubbles
Kids love bubbles. Blow bubbles and see if they can pop the bubbles before they hit the floor. Then see who can catch bubbles on their wand. If you have older children attending the party see who can blow the biggest or smallest bubble. Give away bubbles as party favors - print out large labels with your child's picture and "Thank you for sharing my ___ birthday!"

Treasure Hunt Game
Choose large plastic eggs, balls, party favors or any item from your birthday party theme* and hide around the living room, backyard or park while the children aren't looking. Hold up one item like the ones you have hidden and tell them to search and find the items. The one who finds the most items gets to help hide the objects for the next round. Have children return the items to a basket and hide the items again... and again. Extra ... after the games divide the treasure hunt items equally and send them home as party favors.

Parade
Kids turning 2, 3 and 4 love parades. Make your own birthday party parade by giving children musical instruments - drums, shakers, horns, etc. and have them follow you around the house or yard playing their "birthday song". Or have the children follow you with streamers or ribbons and have a dance parade. If the children all have doll strollers or wagons let them parade with their dolls and stuffed animals.

Hokey Pokey
Children love this simple game and it is fun to play at a birthday party. Have children stand in a circle. The leader begins the song and have everyone join in. Leader puts their right arm in the circle and sings "You put your right arm in ... you take your right arm out ... you put your right arm in and you shake it all about .. you do the hokey pokey and you turn yourself around and that's what it's all about! While singing the song put your right arm in the circle, take your right arm out, put your right arm in and then shake it up and down, then have your index fingers point to the sky while turning yourself in a circle, clap the last line of the song ... That's what it's all about!

Color Poster boards
Write children's names on the top of the poster board and let them use markers, paints and/or crayons to color all over the paper. Tape the paper to the top of a table, or if it is nice outside make a easel by taping the poster board to a fence.

Dancing
2, 3 and 4 year olds love to dance. Play music and let them freestyle dance at the birthday party.

Freeze Dance Game
Play fast music and let the kids dance. Then stop the music (or call out "Freeze!") and everyone must stop dancing and "freeze" in that position until you say "Unfreeze". Then start over and have them dance again.

Duck Duck Goose Game
Children sit in a circle on the floor. The birthday child (patter) starts by walking around the outside of the circle and patting the head of each child. Every time they pat a head they call out "duck". Then they choose one person to be the goose and yell "GOOSE!" when they pat their head. The “patter” then runs clockwise around the circle and tries to sit down in the place of the goose before the goose tags them. If the goose tags the patter then the goose sits back down and the patter starts again. If the goose doesn’t tag the patter then the goose becomes the patter and the game starts again. Game Variation: Use your birthday party theme with this game: Buzz, Buzz, Sting for a Bug Party; Tick, Tick, Tock for a Pirate Party

Sidewalk chalk
Give children large sticks of chalk and let them draw on the sidewalk, porch or driveway. Our sidewalk chalk games are fun for all ages!

Good luck!!! Savannah went to a picnic/party last weekend and it was about 20 kids, all ages but mostly girls, she had a kiddie pool, a bigger pool, slip n slide, and this water hop skotch thingy - all the water toys except the baby pool broke in about 20 minutes!!! She had a friend do face painting and fake tattoos, that kept them occupied but the sprinkler made a muddy mess - I couldn't wait for cake time to come so we would leave!

We have alot of cousins with kids, close friends and now our friends with kids and Stephen's best buddies from school. The list grew quickly over the last year LOL I wanted to have it somewhere else, but Dh wanted to save $$ (and it isn't going to be much cheaper at our house!!!) and have it at home. Now he is like uhhhhh..... I forgot a did buy a pull string pinata.
Thanks for the ideas. I am going to start planning early. As much chaos as it is going to be, Stephen is so excited about his friends coming! His best friend Niklas is coming, when I told him the look on his face was priceless!!!!! :) Praying our house does not get destroyed....:o

Good luck! That's a lot of kids! We will probably have about 9 at Jenna's party, and 4 teenagers or so. We're having the party at MIL's house since she has a pool, so the only games I have planned other than that are the pinata and "pin the birthday hat on the lizard." Through the years, one of the most important things I feel I've learned is not to try to schedule things for the length of the whole party, because the kids need time to just play freely as well. After all, it's not often they all get together just to play like that. :)