I went to a presentation evening for new parents last night...............................................

[nametaken]

and there was a spelling mistake in the presentation.

Great start

Just one? What was it?

necessary - spelt "necesary"

We had this when we went to the open evening for dd2. They had a Stationery stall; unfortunately it wasn't: it was a "Stationary" stall. The worst thing was they didn't change the sign, even after a number of parents had commented on it - they told me I was the fifth to mention it.

tahy could be a typo though...

neverthekess it shouln't have been there.