The Bad Batch world premiere is on Tuesday, September 6. at 7:15pm (Italy time) in the Sala Grande. The world clock is here for those who need to convert time zones. The press conference is usually on the same day but I have not been successful finding it on their schedule.
They post video clips from the day’s activities on their youtube channel here.
They post photos from the day’s events on their FB page here.
They post clips and photos in the media center on their main website here.
They have a live streaming page here but it is not clear if it is operational for everyone or just those in Italy.
Update: Their twitter feed is here and their flickr page is here.