Attendance checking is a time-consuming, yet important activity in many kinds of events. Most approaches to attendance checking automation require specialized equipment to be installed. A more appealing approach is to use mobile devices such as smartphones that are ubiquitous nowadays. We propose a context-aware attendance checking service based on a mobile device management (MDM) system. This approach may be used during a wide spectrum of events, and requires a limited set of equipment that is commonly available when a conference or a lecture takes place. The service can identify an attendee’s mobile device using QR-codes, Bluetooth, or Wi-Fi. User authentication is provided by the underlying MDM system.