alcohol quantity help!

need opinions on the distribution of alcohol! we are doing a "you buy it-we serve it" with our catering. some important details:

* 50 guests, wedding is from 4:30pm - 9pm * our venue does not allow hard liquor, which is why it's only beer/wine/cider * our caterer is providing water and lemonade (and coffee) * our wedding is a garden wedding in june and we are serving chicken and fish (so we currently have much more white wine planned) * we are in washington state, so we can return unopened alcohol (we are fine overbuying, but we don't want to cart around a ton of unnecessary alcohol)

thank you so much for any thoughts!! <3