At Diwali the people of Savar and Kundla hold Ingoriya ni Ladai, a symbolic contest fought with hollowed Ingor fruit seeds filled with a gunpowder-like mix. It is a mock fight, not a feud, and it falls in the season when shops on both banks send greetings and offers.
On WhatsApp the season's rules are the year's rules. A Diwali offer is a marketing template and goes only to customers who agreed to receive offers; a greeting with an offer in it counts as marketing too. Replies to customers who write first need no template for 24 hours.