According to data in the UK from May last year, more likely to be in a crash (although total trips were down, as you note). Link below notes crashes around a couple of football events went from 16 (in jan) to 70 (in mar). I don't think pedestrians enter into it.

So perhaps more risky driving occurs when fewer other cars are around? Maybe the risk-averse stay home, leaving only riskier people to go out? Clearly, the pandemic had an indirect effect here though.

https://www.vin.li/era/covid-uk-report/