• Is it just a family get-together with a big meal? In which case why doesnt that happen more often?

    I also come from multi-festival culture.

    For Diwali there is a certain ritual per day (usually for 3 to 5 days).
    For Ganesh Chaturthi its choice of each family ranging from 2 days to 10 days to celebrate.

  • Is it just a family get-together with a big meal?

    yes

    In which case why doesnt that happen more often?

    pain in the arse

    different families celebrate it differently. there's loads of small rituals. acceptable to drink upon waking. exchanging of gifts. reasonably good TV on (this was more of a thing in the olden days), kids love it, acceptable to eat chocolate upon waking, special meal with elements not found on any other day, way too much pressure to enjoy it, happy once over

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