If you're looking for more complete collections beyond the MovieCon channels:
Warner Bros. Entertainment and the official Tom and Jerry YouTube channel regularly upload for free. Create a playlist. While they aren’t MovieCon-exclusive, they are 100% legal.
: You can find specific episodes like "Little Quacker" or "PurrChance to Dream" hosted on Dailymotion under the MovieCon banner.
frequently uploads compilations and full segments of classic episodes.