After 5 EventsThe building sets the timeline, not you
You will be told a handover date and it will move. Not because anyone is careless — because construction has variables and events do not. Work backwards from the ceremony time, not forwards from the date the contractor promised access. That means knowing what you can set up in four hours instead of the day you had hoped for, and it means choosing a production partner whose truck is already packed when the call comes that the floor is dry.
The guest list is live until the venue is real. Officials wait for confirmation that the building is safe to enter, press want to know there is something to photograph, neighbours are polite until the day of. Hold the final count as late as the caterer will let you.
Power, sound and every cable that connects them
The building's own systems are not commissioned. That is true even when the electrician swears otherwise, because the difference between 'the panel is live' and 'we can plug a PA into it without the site manager watching' is a day of back-and-forth you do not have. Bring a generator or know exactly which circuits are signed off for public use. The cost line is the generator and the fuel, and the decision is whether to pay for certainty or spend the morning of the event on the phone with the electrical contractor.
Sound is the same. The building has no house system, or it has one that nobody has tested with speech, which is the same thing. You need a PA brought in, a mixer, and someone who stays for the speeches because the official who was told they had three minutes will take seven, and the microphone will feed back halfway through unless there is a hand on the fader.
A small opening — sixty guests, two speeches, an hour of music from a playlist — can run on a portable column system if the room is hard surfaces and under a hundred square metres. Any larger and you are hiring a rig: mains speakers, subs if there is music, a mixer, wireless mics, and the labour to fly or stack it before anyone arrives. That is where the cost moves: the moment you need a rig instead of a box.
The outdoor plan has no contingency until you put a roof on it
Many grand openings are outside — the building is the backdrop, the ribbon is at the door, the guests are on the forecourt. That is fine until it rains, and it will rain, if not in reality then in the mind of every official who has been caught in a June storm in formal shoes.
A marquee is expensive and justified. It is the cost of the event happening on the day it was announced, regardless of weather. The alternative is a narrow one: move everything inside to a building that is not set up for guests, or postpone in front of the people you invited to mark a fixed date. Neither is cheaper than the marquee.
If you do put a roof up, the ground underneath it is now your problem. A forecourt in front of a new building is usually aggregate or fresh paving that has not settled. It is not flat and it is not dry. Flooring costs more than the marquee and is the thing people notice if it is missing.
The tour is the content; the programme has to be short
People came to see the building. The speeches are context and the reception is courtesy, but the tour is why the calendar invite was accepted. Make it possible: clear routes, accessible entries, guides who know which rooms can be entered and which are still taped off, and a timing assumption that is twice as long as walking the route empty would take.
The programme around it should be short. A ribbon, three speeches maximum, a toast. The louder and longer the programme, the less it looks like the building matters. Officials have next appointments; neighbours have children to collect; staff want to see their new desks. Give them the building and let them leave.
Two kinds of event company
One kind takes your brief, adds margin, and sends it to the PA company, the caterer and the staffing agency they found that morning. The other kind owns the kit, employs the crew, and has done this exact setup — the generator outside, the mixer in a road case by the temporary bar, the mics checked while the caterer is still unloading — many times before, in buildings at every stage of nearly finished.
The difference is not in the price; it is in what happens when the contractor calls at seven to say the access door is still locked. The first company starts making calls. The second is already on site and moving to the contingency it packed for.
After 5 Events is the second kind. Same crew quotes, rigs, runs and closes the event.
Decide the access and the roof, then call
The conversation you need to have is about the building's state and the outdoors plan. Know when you have guaranteed access — not when the contractor hopes, when the contract says — and whether the ceremony is outside. Everything else follows from that: the power supply, the rig, the weather plan, the setup window.
Settle those two, and the rest of the brief is an hour's work.