I refer you to Sindy’s comment (she is actually an expert) but I want to note and verify that it sounds as if you may not actually be thinking of collecting individual-level data, and that you’re thinking of making observations at the village level (e.g. what % of people in this village wear masks?). So it’s not just the case that you wouldn’t have enough clusters to make a statistical claim, but you may actually be talking about doing an experiment in which the units are villages… so n = 6 to 12. Then of course you’d have considerable error in the village-level estimate, and uncertainty about the representativeness about the sample within each village. I agree with Sindy that you probably don’t want an RCT here.
OK, thank you.