You are probably basing your belief on "the existence of pictures/photographs of the event ".
The recollections of what you had for breakfast, your first day of school, and your cousin's wedding are precedents of episodic memory. Episodic memory is one of two sorts of declarative memory. Declarative memory is a sort of long haul memory that alludes to actualities, information, or occasions that can be reviewed voluntarily. It is the memory of autobiographical occasions that can be expressed or invoked. It is the accumulation of past personal encounters that happened at a specific time and place.