Inspired by a thread I saw elsewhere...
Mine would not be a big event, really. I would not have a funeral. There would be the completion and activation of my tomb, though.
I shall be laid to rest within a massive ziggurat, with my guitars sealed behind sheets of diamond. This ziggurat will float in the near-vacuum of space, as it will be situated upon a large asteroid in the asteroid belt.

The place will be cleaned and serviced by giant tardigrades. They would also be the guards of the place, as they would have a strong plasma armament mounted on their chins.
The ziggurat will be inhabited by a holographic simulation of me in my prime, and it will be discomfortingly naked, beergut and all.

I would usually be found casually riding one of the aforementioned giant tardigrades.

Alternatively, the asteroid itself if it is properly rocky could be internally excavated into my royal tomb. Because there is barely any gravity to speak of there would be no ground, so doors and halls would appear in any direction...