Meeting planning software provider SignUp4 has been acquired by Cvent Inc. (NYSE: CVT) for $22.4 million, according to a regulatory filing. Atlanta-based SignUp4 provides event management solutions for corporate meeting planners, travel planners and event management agencies. The acquisition broadens Tyson Corner, Va.-based Cvent's customer base and product offerings. Upon completion of the acquisition, SignUp4 will become a wholly owned subsidiary of Cvent Atlanta. Cvent went public in August...