It seems to be a common occurrence that courses have temp greens or tees, a less common thing that the customer is warned about such. When that happens - and when God forbid a discount is given - that's when a happy, loyal customer is produced.
So from the perspective of the operator, I guess it depends on supply and demand and how much you want to risk pissing off your customers, and how much you care about making them happy.
Here in the SF Bay Area, home of one of the highest golfer to course ratios in our nation, rare is the place that gives either warning or discount. What do they care? The tee sheets are going to remain full regardless.
I'd hope, however, that we are the exception, not the rule.
And out there in the real world where happy customers matter, I'd have to say warning customers is a given, and 33% discount would seem fair. If they can't live with the loss of current revenue, then a coupon for 25% off a future round would also seem to be the least they can do.
That's my way more than two cents, anyway.
TH