Ramadan involves a number of societal changes beyond just not eating during daylight hours, from fasting to abstinence to busier public squares and restaurants. I'd want to see something control for the differences in movement patterns, passenger miles driven, meals eaten outside the home vs. at home, and so on. Public squares and restaurants are typically packed during Ramadan at night.

Here's one (theoretically) similar example:

https://www.datagraver.com/case/relation-terrorism-attacks-a...