Schools do regularly raise funds or collect items for charities all year round. I have been the recipient of a great variety of gifts and cards, bought and home made, over my 40plus years working in schools . I have two still in my possession. A cross stitch book mark and a small vase & card from a lovely family who were delighted that I had included Hanukah traditions in the December celebrations so that Zoe felt included. I tried to explain that it was normal for me to do so along with Divali celebrations but it had obviously meant a lot to them! My DD is also a primary school teacher and is most likely to shed a tear over kind words of appreciation in a card than another 'best teacher' mug, no matter how kindly it was meant!
I only used the phrase 'virtue signalling' because so often choices to act in a positive way are dismissed by the phrase
virtue signalling. I suspect it was a phrase invented deliberately to undermine good deeds, by mean hearted folk!