How to come back from a week binge

Yes. Just don't weight yourself for a week. Any weight gain you see will likely be water weight anyway. A week can be demoralizing, but nobody gets fat overeating for a week. It's a lifetime thing.

Don't worry about making it up. Wipe the slate clean and start over.

Last week I was off from the gym, didn't work out at all, went to a 3 day music festival where I drank a TON of beer, and ate everything. I was averaging about 4000 calories a day at least. I didn't log anything...

It's a new week. You just start over. If you can't stop cold turkey then just start by eating less of the high calorie foods, encourage yourself to drink a lot of water - have a glass when you feel hungry before you eat anything. Wait 10 minutes, if you are still hungry eat something. Try to have a salad or vegetables with every meal - eat that first

It's hard sometimes, but all you can do is just get back on the wagon and try again. It's not going to be the last time you fall off - I do it every few months (usually by choice but sometimes not) Start developing your plan to deal with it now so that you get really good at it. One day/One week isn't going to prevent you from EVER reaching your goal You can do it!

It's all mental. Just renew your commitment to healthy eating/ calorie counting and move forward. For me it helps to remember that it takes 3500 calories OVER maintenance to gain just one pound. A bad day, or even a bad week isn't going to undo all the progress I've made.