I have visited Tokyo Midtown on three occasions, and each time I've had an excellent time. The first time I came here was to see a giant 1:7 scale statue of Godzilla. The second time was for the Tokyo Midtown Award 2014, and art and design competition supporting designers and artists of the future. And the third time was at the end of 2014 for the annual Winter Illuminations; specifically Starlight Garden where millions of dancing lights, cool smoke machine effects, and haunting music make up an impressive show.
Tokyo Midtown has so many events and exhibitions, so whenever you visit, you are guaranteed to find something of interest.