It had been snowing all day. A great many people managed to get to the end-of-term concert

Very few people indeed were prevented from getting to the end-of-term concert by the heavy snow

Since there had been snow all day long, it wasn’t easy for people to get to the end-of-term concert

As it had been snowing heavily all day, a great many people just could not get to the end-of-term concert

A lot of people did get to the end-of-term convert in spite of the snow that fell all day