Hiya, Matt! I'm so happy you stopped by planDisney with your question.
Character meet-and-greets are an important part of every family trip I've taken and the photographic evidence is currently hanging on my walls! I love tracking my kids' growth over the years in comparison to Mickey Mouse and I'm happy to chat with you about where to find this famous face!
Matt, at EPCOT you'll (currently) find
Mickey meeting, greeting, hugging guests, and signing autographs at the Disney and Pixar Short Film Festival which is
located next to the Imagination! Pavilion. If you're entering EPCOT through the main entrance with
Spaceship Earth in front of you, once you pass that spherical icon, head off to the right. This will be past The Land, but before you enter World Showcase.
If it fits into your plans, I encourage you to visit during the first half of the day in case Mickey gets called away to rescue Goofy or Donald from any shenanigans they've created. I would hate for you to try to jump in line right before park closing only to find out that you've missed him! In my experience, many characters at EPCOT stop meeting around dinnertime.
Matt, I'll be wishing on a star that you have the perfect photo with Mickey to remember your day at EPCOT. If you have any other questions, I would be happy to say (as Mickey would), "see ya real soon!"
Lauren