A haircut before the wedding makes sense, as long as it is done at the right time and does not change what was decided at the trial.
Why a haircut right before the wedding is a risk
The hairstyle is designed at the trial on hair of a particular length. A last-minute cut can leave it too short for the chosen updo or change the way it falls, and there is no time left for it to grow back.
When to get a haircut before the wedding
The best time is a small hair trim one or two months before the wedding, without overdoing it: just enough to tidy the ends, without changing the length the hairstyle was designed for. If you fly in for the wedding, have it done by your own hairdresser at home, at that time. That way the hair that reaches the wedding is the same hair that was styled at the trial, and the hairstyle turns out as it was decided.
