No HAMTV Video Contacts are currently scheduled, due to malfunction of the HamTV Transmitter on the ISS. (more information)
HAMTV is a Digital Amateur TV transmitter in the ESA Columbus module which allows a live Video Downlink of the astronauts to the audience during ARISS Contacts, enhancing engagement and facilitating live zero-g demonstrations.
This distributed earth-station support system has been built by Phil Heron MI0VIM and Phil Crump M0DNY, with support of the British Amateur Television Club.
For the latest news of HamTV on the ISS, see ARISS HamTV on the BATC Forum