I can provide you with some speculation based on scientific knowledge.
If we consider highly advanced extraterrestrial civilizations capable of interstellar travel, it is conceivable that they would have the ability to witness galactic planetary events in real time, or at least with significantly reduced time delays. By having advanced propulsion systems or utilizing concepts like wormholes or warp drives, they could potentially travel vast distances within the universe.
By being able to travel anywhere, these hypothetical civilizations would have the opportunity to observe cosmic events that occur across different regions of the galaxy. They could witness phenomena such as planetary collisions, stellar explosions (supernovae), or even the formation of new star systems. This ability would give them a front-row seat to celestial events that would otherwise be challenging to observe from Earth due to vast distances and limited visibility.
However, it's important to note that our understanding of physics and technological capabilities is based on current human knowledge and theories. Speculating about the abilities of advanced alien civilizations goes beyond what is currently known. Additionally, the constraints of physics, the vastness of space, and the potential limitations of any advanced civilization's technology are factors to consider when pondering such possibilities.