The 10th IACHEC meeting will be held between April 20 (Monday) and April 23 2015 (Thursday) at the Fragrant Hill Hotel, a four-star hotel in Beijing designed by the world-renowned architect I.M.Pei.The IACHEC meeting will be an excellent opportunity for international cooperation in efforts to calibrate instrumentation for high energy astronomy. All the operating X-ray and gamma-ray observatories and most planned missions are expected to be represented. The IACHEC meeting will be followed by a HXMT Workshop on April 24 and 25 (Friday and Saturday). The HXMT workshop will aim at discussing specific aspects of this forthcoming mission, like its scientific goals, calibration, estimation of background and so on.