Two chance meetings on the same day

I am a British national living in Japan. On the same day, both my wife and I had chance encounters with friends travelling outside their home countries. I was in a ramen bar in Shibuya, Tokyo, when my cousin from England walked in and, without realising I was there, sat down next to me. Although I knew he travels to Japan from time-to-time, I did not know he was in the country and had not contacted him recently. I eat in Shibuya perhaps once in a fortnight. He, perhaps a couple of times a year. Shibuya is a district of over 200,000 people, with a population density over 13,000 per square kilometer, and restaurant options to match. The chance of meeting a fellow Tokyo resident in Shibuya is low, let alone a family member from another country. On the same day, my wife who was on a business trip in Seattle, discovered that she happened to be staying in the same hotel as a friend from Italy, who happened to be travelling in the US for a conference. They were both travelling for different purposes, the friendship is unrelated to any industry or event in Seattle, and they were both there for the first time. I'd expect these kind of events to happen to most people once every few years, but to have the same sort of coincidence happen to my wife and I independently, on the same day, seems a great deal less likely.