One of the first thoughts that came into mind after my brother asked me to be his best man was "Great, now I have to plan his bachelor party" (after saying yes, of course). After hearing about so many communication problems related to this planning over the years, I was not looking forward to it.
Then, as I'm sure many other indie hackers had happen to them, I thought "I can make this easier!". Thus, BachBash came about! (Though the name took a lot longer than the actual idea.)