Classic board games are the best way to keep folks in the party engaged. Zoom has a bunch of fun and easy board games, like Virtual Taboo that you can host for your Diwali party. The website playtaboo.com offers a simplified version of the game. Divide the group into two teams, take turns to draw cards that have words that you want the folks in your team to guess, describing what the word is without using any of the words listed on the card below it. Whoever describes the most words wins the game night.
Cards against Humanity
If you and your pals prefer having Zoom calls then you can pitch for the Cards against Humanity game on Diwali night. There is a free version called Remote Insensitivity that allows you to play on your phone while simultaneously having a video chat on a PC. Just share the link to your personal game room and you are all set to go. PS: It's an Adult-only game.