Groupon has bought a New York based startup company called SideTour. SideTour helps organize events like cooking classes and tours for small groups. The terms of the acquisition was undisclosed. SideTour launched two years ago and raised $2.5 million in funding this past March. SideTour will be operated separately for a while, but it will also be integrated within the GrouponLive service. Groupon also recently acquired a hotel booking company called Blink.