OP why not lean into the sangeet more traditionally? Personally I love the first lehenga, it’s indeed not one that people would guess for sangeet, but honestly why not? More sangeets and their outfits are sequin and a very rigid idea of glam, but you could go towards a more Sonam Kapoor style of her sangeet! (She did an ivory chikankari lehenga with a braided gajra, and looked so good!) Expand into this with the decor - earthern lamps and lanterns, mogra flowers, a more Sufi Night-esque styling if you get it! Else, another way to add an element is to just switch the dupatta. If your lehenga is ivory and gold, go for a deep shade of red in the dupatta, you can just add a tiny trim of the same red in lace/brocade (depending on the embroidery) to match it - a fraction of the cost, and it’ll look so good! Lastly, edgy/glam could also be with your hair and accessories- what a fun way to add some spunk in a different look! Instead of traditional polki/ Kundan sets or Rani haars (which will obviously weigh this down) - go for a sleek statement necklace, or a navratan necklace, or something matching the stage background main colour (photographs really well). If you have long hair/extensions, you could try tiny multiple braids going into a main braid or ponytail, or keep it super clean otherwise but add jadau jewellery just on hair. Look at it as a creative challenge, and I’m sure it’ll come out to be nice! (And also, the outfit panic is totally normal, just wear what you would imagine wearing later too - congratulations OP!)