The main conference was livestreamed from this website, which was active during the conference.
Videos of talks can be found at the ETAP4 playlist from the UMass Amherst Linguistics YouTube channel. The videos (and OSF materials) are also linked from the main workshop program.
AAE workshop materials (slides, handouts) are available from the OSF repository and linked from the AAE workshop program.
Presenters are strongly encouraged to upload their presentation materials (posters, slides, extra handouts, etc.) to the OSF repository.
Conference participants can sign the photography/video release form here.