Did you know that the future can be organised by imagining it to have happened already? Time is a torus - a ring doughnut, if you like - of past and future waves that meet in the central Present, and the waves are multiple - they include variables, so that Superposition (being in multiple states at once) is supported. This means that nothing is fixed until the Present moment lands, and from there everything is variable again - on both past and future lines!
This doesn't work for our brains, as our brains exist as 3D objects and operate according to 3D parameters. The brain more easily imagines an arrow of time from past to future. That's an illusion!
You can imagine the past differently, and change the future line that relates to it. Drop a grudge and forgive someone, and the resultant relationship changes. Your memory of the event in 3D is a fixed image, but the variables of its happening are still there. Some variables have played out already (including the one you remember) but others have yet to occur.
You can do this with futures, which will then align with an appropriate past as the rules are the same in reverse. Law of Attraction advocates use this principle in their advisories.