Event Budget Calculator — illustrative example INPUT Venue USD 500; food USD 15 for each of 40 people; contingency 10% of those costs. RESULT Food: USD 600. Base cost: USD 1,100. Contingency: USD 110. Planning total: USD 1,210 before any unlisted taxes, fees or income. REVIEW An event budget should separate fixed costs from per-person costs. Calculate contingency from a stated base and identify whether taxes, service charges and expected income are included. This is a teaching example, not a live execution record.