The CollaTrEx framework for collaborative context-aware mobile training and exploration is designed for the in-situ collaboration within groups of learners performing together diverse educational activities to explore their environment in a fun and intuitive way. It employs both absolute and relative spatio-temporal context for determining available activities and supports seamless collaboration in spite of temporary connection losses or when in remote areas. This demo showcases the prototype system and front-end implementation for tablet devices, inclusive of new activity types such as contour drawing, which aim at aiding memory retention to provide a more effective learning experience. [For full proceedings, see ED571459.]