LogFAQs > #928734044

This is a little late and not particularly useful, but I learned a while back that on a Community Day you can get a field research from the same Pokestop up to three times.

A Pokestop's research isn't registered as "completed" until you get the reward for it. So you can get a mission from the stop before the event begins, then as long as you haven't gotten the reward from it, you can get the new CD mission from that same stop once the event starts. You can take it a step further and also not get that reward, and once the event ends you can get the original research mission from the stop a second time. (You could instead hit two Pokestops twice using this method, but it can't be done with three because once you grab any reward, that stop is permanently "completed" for the day.)

It's mostly just trivial information that I found out of curiosity. But if you plan to be in one place the whole time and you find a particularly valuable research mission, it could be worth doing.
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Official King of PotD
You only need one T-Rex to make the point, though. ~ Samus Sedai