I didn't forget at all man.
Multiply the number of beers in the fridge because my stupid state won't allow me to buy after 9pm. aka the Plan To Get Drunk Theorum
Then divide by the possible number of friends that'll show up to drink said beer and multiply again. aka Cover My Azz To Ensure Drunkeness Theorum (Might explain the second fridge for alcohol)
Now add or subtract beer to the fridge as the friends bring it or drink it. Also known as the How Good Of A Friend Are They Hypothesis
Which leads us to the answer ... Are They Ever Getting Invited Again!
Stop laughing..you got work to do.