which?where?

This is not a piece of advice to you I'm talking to myself for my practice of writing skills.
I suppose that it'd considerably depend on person experienced the event by oneself or not.
I suppose It'd be generally be the word 'where' , not a few people'd might insist the phrase 'in which'.
:“In Which” Versus “Where”.
https://www.hotpepper.ca/blog/2009/11/20/in-which-versus-where/