Visitors after baby

So we have grandparents that want to go ahead and buy plane tickets for around when baby will be born. However I’m not wanting visitors right away at all, neither does my husband. It was a total disaster with our first with the constant visitors dropping by. The moment we got home everyone was there the next day to meet baby for like a month straight.

I know buying tickets in advance is cheaper. However these sets of grandparents buy plane tickets for next sag flights on a whim. Is it wrong to tell them to hold off on buying tickets until we’re ready?