Big birthday party

I had my big party on Saturday evening - over 70 people came which was an excellent turnout. So far the collection for Ataxia UK has raised over £500 but I'm hoping to find a few cheques in the cards which I'm opening on the day itself (Wednesday).

Which birthday?? It's a multiple of ten, I attended university from 1969 - 1972 and Dazed was born in 1978. I'm sure you can work it out! If you need another clue, I'm going to work on the bus tomorrow.