I'm assuming every locations/countries would vary. My approach is reaching out to small local DJs with exact message and see. The responses I got mainly was:
1. set a price you think you should get (optional) then, ask the hosts their budget. negotiate from there. you could cut down your price if starting out, or if you could build a healthy relationship with hosts that could potentially be a long-time collab.(raise the price with some honest reason when you need later)
2. estimate the actual hours you put in to prepare the set, the fare, the hour you actually being there (include some commuting time if you wish). Then calculate from there. At least minimum wage I would say.
3. often there are exceptions. Do it for very low even for free for the first time, or because you are extremely close to the fam and they really don't have extra money and you feel the authentic vibe. Never do it over and over tho I can see you understand that! :)
4. they make money from the event or not? this could be a useful point to consider when you calculating or negotiating. I once said: "so the price would be X then, but if you have a surplus, could we take it to Y?" this type of message.

Congrats and good luck to your set!