What percentage should be reserved for contingency?

A share of the total, set according to the event’s risk. What matters is separating it from the start.

What is the biggest line item of an event?

It depends on the format: in person it is usually venue and catering; virtual, production and technology.

With an actual-spend column, approvals against each line item and a weekly review.

Creating the event is free. Modules such as networking or bingo have list prices on the pricing page.

Event budget template: line items and how to estimate them · EVIUS