Listen, the world is not going to end if you don't revise your novel tomorrow. I know. You have a schedule. You don't want to get behind. You need to revise one scene tomorrow so you can hit your self-imposed deadline, even though you could probably just do an extra scene tomorrow. Or Friday. Or Saturday.
Look, I get it. I really do. You like your lists and plans and schedules and stickers. You're Super Duper Type-A, and people sometimes praise your work ethic higher than your personality. But guess what, Buttercup? The world is not going to end if you miss your made-up deadline. Hell, you might not even miss it. Relax, lady.
I'm telling you, you need to get used to the idea that you cannot always make time to write every day. The "problem" you have tomorrow? It happens every two weeks. Get used to it. Yes, you'll lose your two hours of Pre-Day Job writing time for that early morning meeting. Yes, you won't have time to write in the evening because of the weekly writers group you attend (and love, by the way. Remember how much you love it). Get used to the idea that every other Wednesday is going to be unproductive in terms of pages written/revised.
But that doesn't mean it's unproductive for you as writer.
Interacting with your Day Job colleagues helps you grow as a professional. Growing as a professional, and interacting with other humans, is good for you. Take note of personality ticks and group dynamics. This is useful information. It is not wasted. (Plus, you know, it's part of your JOB that you actually get PAID to do, ya goof.)
And that writers group? So valuable! Interacting with other writers is awesome and so fun and so helpful. These folks make you laugh and help you grow as a writer. Taking an evening off from your revisions to spend a few hours with them is time well spent. I can't believe I even have to tell you this. Seriously. Stop with the Schedule Perfectionism already.
Cause really? Life is unpredictable.
Writing is unpredictable.
Publishing is especially unpredictable.
The world will not end if you take a day off. This is a marathon, not a sprint. It's about quality, not speed. *insert several other relevant metaphors ad infinitum* You get the point.
Relax. Breathe. You'll get there.
Happy belated birthday, ya nerd. Go buy yourself a new calendar or something.