Wu Ji and his team went to Japan for an Asian MMA training camp. In addition to the training, there's a few friendship games and regular competitions, too.
The fighting conditions in Japan were considered very good in Asia, featuring both an excellent social foundation and atmosphere, as well as plenty of competition experience. Kyoto, especially, is the best site for large fight competitions in Asia outside of Macau.
When Wu Tong realized Wu Ji was going to Japan — and after finding out about events at the Singapore airport — she instantly called Meng Fan. It sounded like Meng Fan was staying a few days in Japan, so she instantly thought of having Meng Fan find Wu Ji.
She was still worried for Meng Fan!