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All you can do is look at the roast and try to guess what sort of fineness you're going to need. My rule of thumb is the lighter the finer. After a while you get to the point where you'll get drinkable shots even if wrong, particularly if you're on a lever machine which is way more forgiving. Agree with @Ptown on taking note of roast level and origin for a better ballpark to take the guesswork out of it! I get a different coffee every 250g but that still means 13 coffees with 1 for dialling in. But agree that coffee advent calendar with single dose per day seems like a bad idea for espresso.
youClown
Having just started with home espresso, I can't comprehend how you can get a good shot first time with a different coffee every day. I just opened a new bag, and keeping the grind the same as I was reliably getting 25-28s shots before, I got a 15s shot this morning.
How can I try new coffee without repeatedly wasting 2-3 shots of every bag?