There’s no better explanation than the proverb “hope for the best and prepare for the worst” when the big day comes near. If you rent, a guest can get injured, a relative might settle differences, and an attendee might cause property damage or injuries. Even a bride or a groom can say no, which can cost professional advice.
Nobody can erase memory, but debt and financial struggles due to unforeseen circumstances are avoidable. The key is getting that day protected with special events liability insurance.