I think you should go with a Canon 700D and a 17-50mm f2.8 from Sigma or Tamron. Use remaining cash for external flash, battery expansion/ AA conversion, memory cards, etc.
Let me give my reasons so that confusion doesn't occur. Mostly, marriages and events' photography suffers from low light. Photos may get blurred and useless. Cranking high ISO will increase light, but also image noise.
Inbuilt flash causes problems like background getting pitch black, red eye, plus it highlights any facial blemishes and defects on people, so it doesn't look good.
750D/760D are useless for most of us, they're only minting Canon some money for (mostly) a high 24 megapixel sensor. You mostly do not need this high MPs as the 700D already has 18 which is enough for even large A3+ prints at decent quality, unless you want to crop heavily.
Plus, lesser megapixels mean more light and lesser noise at high ISO.
Secondly, the f 2.8 zoom lens I recommended will ensure enough light for you in emergency, across the entire zoom range. The F4 lens recommended by someone else, will give significantly lesser light.
Plus, my recommended lens will cover a wide range of important focal lengths so you don't miss any moment.
Without good light, your photos get blurred which are totally useless and nothing on earth can make them proper again.
Conventions be damned. Or well maybe not.
I would recommend Sony ILC-6000, not a DSLR, but a capable mirrorless nevertheless. And I doubt any DSLR under 70K can provide you videos as good as A6000(and same goes for images, both Nikon D7200 and A6000 share same sensor).
Now there is problem of price, the body itself is around 38K-40K and as stated above, you need a good enough lens for shooting. For APS-C E mount, I think SEL18200(18-200, 3.5-6.3) is the best bet, since it can cover a wide focal length...just it is little bit pricey, with shop price around 43K to 45K.
Edit: You can also look for Sony 18-105mm F4 G OSS (SELP18105G). The good thing about this lens is that it is cheap, at 35K-33K range in shops, and comes with excellent image stabilization capabilities.
See, today's mirrorless' are indeed good technically (except for slower AF), I would not counter you on that.
But in the market, believe me, you will get less customers.
Go with a Canon 1200D and try going in the market with a Sony A7 (Full frame), and you will get more customers in the first case while A7 is much superior, we all know that.
Sad but that's the truth about Indian market. Plus not much accessories exist for mirrorless cameras.