So what's the opsec tips on putting up flyers these days?

@cam the yellow dots are kinda unavoidable from standard printers unless you have a black and white printer from before the mid 90s. https://www.eff.org/pages/list-printers-which-do-or-do-not-display-tracking-dots is a good referrence.
https://github.com/dfd-tud/deda is a way to try to get rid of them.
Generally I'd say you want to blend in, dress nice and like the people in the area you're going. Wear a mask n95 or surgical will be way less suspicious. You could also go the worker route jeans, tshirt, highvis vest.
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@cam I would personally go on a day that you would normally stay home and leave your phone at home. Depending on were you live take public transit or drive in park a ways away and take public transit the rest of the way. And most of all act friendly and natural.