OK, in all seriousness:
A large screw-eye or hook into one of the 2x6 joists will do fine. The 1/4" hole it leaves behind can be filled in with spackle, or leave the hook for next year. Painted ceiling color, it is hardly visible.
You cannot support a 30 pound tree from the sheetrock, but the 2x6 will handle that just fine.
The tree can probably get a hook or screw-eye into the end as well, or wrap rope around the trunk in a double spiral (opposite directions) for about 2 feet, it will grip the tree easily and firmly.
This image or
This image will give you the general idea.
As mentioned, be sure the tree is assembled such that it does not rely on gravity (in the usual direction) to hold it together.