You prevent budget overruns with a realistic budget, based on last year or comparable events. Build in a buffer of 10 to 15% for unforeseen costs. Put all expenditure per category (venue, catering, speakers, AV, staff costs) in an Excel and update it weekly. Request quotes in threefold so you can compare. Say no to scope expansion: every addition must be approved. Communicate clearly when cash flows happen. Keep track of invoices and compare them with the budget. Live Impact works with fixed packages and transparent prices: no surprises.