A wedding
One positive COVID-19 patient who attended a 50-person wedding led to 15 other guests from 10 different households testing positive in subsequent days.

It also led to an outbreak at a long-term care home, where 81 people were required to self-isolate. At least three residents were admitted to hospital, and one died.

Full Article:
https://www.huffingtonpost.ca/entry/fraser-health-covid-graphics-spread_ca_5fac3bd7c5b6d647a39b5100