The Imaginarium set up shop in King’s College for a two-day festival of activities and events designed to challenge, encourage and enchant at the weekend. Saturday proved to be a huge success, with almost 1,000 visitors as the spring sunshine – and the collection of Giraffes Around Cambridge \- brought people on to the city’s historic streets. The Imaginarium – part of the Cambridge Festival, which runs until today (March 28) – was right next to the Senate House at the market end of King’s Parade. From the street you walk on to a King’s College lawn on which there are some large marquees and t…