Budgets are what makes the hackathon work properly. They provide refreshments, meals, prizes, etc. from sponsors. Your budget will come from your sponsors and at times, depending on budget history, any surplus from the previous hackathon's budget.
Things to consider:
- Not everyone is present at every meal. (But sponsors and volunteers need food too.)
- Most hackathons have an attrition rate (tickets sold that will not attend) of 30-50%, usually around 40%.
- Try and have some money put aside for on-the-day emergencies.
Feel free to publish your hackathon budget here! Either as a link or upload it to the repo, preferably in an open format!
MLH provides a template here but it over estimates a lot, including assuming a 500 person attendance.