Puneet,
Pls see below breakdown details by using the last time similar event (NGV Exhibition) that Flow-Thailand had done before.
We may think about mini speaker, umbrella or else as giveaway gift. I can sourcing for the gifts to match with your budget.
Kindly confirm the below budget asap because I just block the space but not confirm anything to organizer yet.
Feel free to add or cut off any item on this. I can work within the budget but the one I proposed , I could guarantee that it will looks professional.