Is this a big enough budget?!

maybe you don't need a photography person so that will save money for cool lighting and the red carpet will be more than 10 and you don't need 300 for your dress save the money for will anything

doing the same thing

You can do this for so much less. Don't waste your parents money. Dillards and Macy's will be having dresses on sale now for homecoming that are darling. Shoes are always a deal at DSW or a shoe wearhouse. If people are starring at your feet, then your party must be pretty boring!
Go to Micheals and buy silk flowers and put them in your mom's vases yourself, try and be a little more creative then just spending the money.
Go to Publix or Albertson's to order your cake. It will be less money, and taste just as good. You can cut this whole budge in half. Go to the dollar tree for your lights or a dollar store. The banners there are also cheaper. You don't need your name, and Happy birthday works great too, and you can use it for future years. Get your party supplies at the dollar stores. A bartender????How old are you???? Get your brother or best friends brother to stand behind the bar area to pass out drinks. 7-8 dollars an hour is reasonable for a high school kid, and it's tax free. 4 hours max is 32 dollars. You do not have to hire a professional bartender- you are onlky 16! Leave the parents to mix there on drinks, or have a parent watch the bar area, and put the kids drinks in a totally different area, letting them pour their own.
snacks are simply and you should be helping, as this is your party.
celery carrot sticks, with ranch dressing in the middle.
Fritos chips with a hot bean dip for dipping or a queso dip hot, in little crock pots.
chicken on a skewer with hot peanut putter sause (sate) is fabulous
mean on a skewer with a bbq sauce on the side works great as well.
develed eggs (you can make them up the night before)
fruit salad for color
mixed nute in various containers around the rooms
crackers with various sliced cheeses
very thin salami stuffed with flavored herbed soft cream cheese always go
shrimp with cocktail sauce
paper plates or regular
don't forget the toothpicks and cocktail and luncheon napkins
these are just the basics. Look in your mom's receipe books under appetizers for tons of ideas

I am a professional party planner

$375 for your clothing? That's nearly DOUBLE what I spent on my outfit for my WEDDING!

We had 60 guests at our wedding and food came to $2000, a bartender is over $400 usually and if you get a bartender you have to pay for alcohol- our total beverage cost was nearly $1000. Admittedly our food WAS catered, but of that cost only $500 went on staff costs. Whatt were you planning to do for food? Potato crisps and hot dogs? because that's about all you'll be able to afford for $50!
Around here photography runs to around $700 for a BUDGET session, for a single portrait sitting you are looking at $150 for ONE pose.
I think you've stinted on the flowers, red carpet and decorations too- I think combined these SHOULD set you back nearly $500 for a set up that doesn't look cheap and half hearted.

You've left off the total you want to spend for snacks. At a party/get together, typically, the food is the largest part of the budget.
We'd have to have more to go on than just a simple cost list...

no not realllyy