150 a plate?!
Just order some Applebee's $20 meals, nobodyll know the difference. 500 on drinks. 1k dress, $300 tux, 1k reception hall rental. 300 Limo. 500 on flowers. 300 photographer. We talking 7k tops
I can see you don't really have a grasp on how much this stuff costs. 500 on drinks isn't realistic, unless there are only 50 people at the party. Even then you'd be pushing it. Remember you also have to factor in cups, ice, juice, soda, etc. 500 might last you 45 minutes.
500 on flowers is REALLY unrealistic. One medium sized centerpiece using a combination of less expensive and moderately expensive flowers will run you like $175. If you're only gonna spend 500 you're better off not using flowers. We got bouquets, corsages, boutonniere and two centerpieces and spent like a G.
1k is also unrealistic for nice venue unless you're using their catering services or unless you're using a small room. Otherwise you'll be spending at least 1.5k. And that may not even include tables, chairs, linen, flatware, etc.
You did overestimate the tux though unless you want to buy one as opposed to renting one.
Food will cost you about $28-30 per plate for basic chicken breasts.
$300 could be kinda low too for a photographer. But since it's just for the party it's not that far off.
As someone who planned my own wedding... This stuff is a lot more expensive than you think.