How upset would you be?

I'd be furious! I understand (would still be upset) if it was like a mandatory project because of something serious but renovations usually aren't mandatory and can be pushed back. Especially considering you've booked way in advance I don't see why they just couldn't wait until after your event. Did they say what the renovations were for?

Is the sister hotel far? Could you use the bridal suite in the sister hotel? I share your same concerns, and I'd prefer to be in a bridal suite at the sister hotel and not a board room with janky lighting. If they can give you exactly what you wanted in the sister hotel I don't see why you guys can't shuttle - that's what my FH's step-sister did for hers. You'll just need to make sure you check times between the two hotels and to make sure you start a bit ahead of schedule so you get there on time. Good luck!

If they are offering the sister hotel, and are covering the transportation since this totally inconveniences you, I would take that.

I know you must be heartbroken over this. But you've got to go to Plan B. I think that's the least they can do. It's better than a boardroom!

I'd be livid. Renovations don't just pop up, they require planning. Did they know they were doing them when you booked the hotel? I would be BEYOND angry

I would be upset too! I would ask for some money back since they didn't warn you ahead of time