Baby shower budget ?!?

C
This is my first baby and I'm to controlling to let someone else plan my shower. However I have out multiple people in charge of certain things, such as decor, refreshments, cakes and sweets, and party favors. 
I'm curious how much the budget should be so far is est about $300 for food, favors and the sweets table I wanted to create. Is that to much; 
I'm doing a coed bbq in the park since I'm having a summer shower I want it to be more relaxed and picnic themed 
How much is average for a shower ?  

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