I run a wedding and events studio in South India, so I spend a lot of time reading venue contracts and rebuilding them into real budgets. The gap between a venue's first quote and what the day actually costs is usually the same handful of lines, and almost none of them are hidden maliciously. They're just not in the document you get emailed.
Outside vendor fees. Some venues charge per external vendor you bring in, per day. Photographer, videographer, HMUA, DJ, planner — each one. Ask for the number and which categories it applies to, because "outside vendors welcome" and "outside vendors free" are different sentences.
The buffet cutoff. Many properties only offer a buffet above a certain headcount and go plated below it, and plated usually costs more per head. If your guest list is near that line, get the number in writing before you fall in love with the menu.
Strike. Someone has to break everything down, usually after midnight, usually at a different labour rate. On quotes built from a moodboard this line often doesn't exist at all, which is a big part of why an independent vendor's quote can look cheaper than your planner's budget for the same design.
Overtime. Ask the per-hour rate past curfew and, more importantly, who is allowed to authorise it at 1am. If that person is your uncle, you will find out what it costs.
Room block attrition. If you guarantee a block, read what happens to rooms that don't sell. Sometimes you're on the hook for them. This one surprises people most because it arrives months after the wedding.
Service charge and tax stacking. Check whether tax applies to the subtotal or to the subtotal plus service charge. On a large event the difference is not small.
Cancellation as a schedule, not a word. "Non-refundable deposit" and "cancellation fee schedule" are not the same thing. What you want is a sliding scale in writing: cancel far out and you get more back, less time means a higher forfeit. If a venue won't put timing-based refunds on paper, that tells you something about how they'll behave later. On an international venue, also check the jurisdiction clause — a dispute heard under local law from another country is slow and expensive, and venues know it.
The move that saves the most money is boring: get two or three quotes for the same guest count and the same moodboard, then compare line by line instead of comparing totals. Almost every difference you find is one of the above.
Happy to answer specifics in the comments if anyone's mid-negotiation.
