There aren't a lot of organised Diwali displays outside of certain areas even when there isn't a pandemic.
Can't you just take some miserly solace from the fact it's a shit Diwali for a lot of people?
Covid has not been kind to those celebrating it meaning many are NOT celebrating due to a Death this year but will still be listening/looking for the fireworks and those who haven't lost anyone are ALSO not with family and friends or getting dressed up and going out so they're stuck with not a lot BUT the fireworks.
Begrudging people trying to make the best of it is petty, the fireworks will mean the world to a lot of people tonight.