I've updated https://plone.org/plone-open-garden with the changed dates (April 12-19) and info about the training being offered this year. I've also added training info to https://plone.org/events/sprints/sorrento-sprint-on-frontend-modernization
(Apologies: we have had many discussions and have taken a lot of suggestions about the format and focus for this year's PLOG and as we incorporate them we are also trying to keep all these content items synchronized!)