Space-time event

Negotiations over the Venue Accords took place in a sentient space-time event the size of a small galaxy. (PROSE: The Book of the War)

When Rose Tyler as the Bad Wolf entity said she was able to see all of time and space at once, "all that is, all that was, all that ever could be", the Ninth Doctor affirmed that he saw the same, all the time. He described this as a maddening experience. (TV: The Parting of the Ways)

Indeed, Time Lords like the Doctor could sense, at all times, which events in space-time were fixed and which were in flux. (TV: The Fires of Pompeii) The Tenth Doctor believed that only certain "tiny, precious moments" were fixed, while all others were in flux. (TV: The Waters of Mars) On one occasion, he explained:

As this extended to individuals, the Tenth Doctor found it difficult even to look at Jack Harkness, because, as Jack was himself a fixed point in time, the Doctor instinctively felt that he was "wrong". The Doctor admitted that him having being made a "fact" was the reason he had abandoned Jack in the first place. According to the Doctor, the TARDIS herself reacted against Jack for the same reason. (TV: Utopia)

The First Doctor described a person's biodata as their space-time event. (AUDIO: The Vardan Invasion of Mirth) Though biodata could be altered, potentially affecting an individual's entire time stream, (PROSE: Alien Bodies, Unnatural History) once a person saw their own future in a biodata projection, it became fixed. (AUDIO: The Vardan Invasion of Mirth)