We have to warn you that you might get banned if you use mod.
This software can give you permission to edit anything in GTA online. Including enabling everything in Christmas part, or anything similar to it.
This software work on Social Club and Steam, so enjoy. Just turn it on at administrator permission.
Visit Se7enSins Forums for some presets and more information
How to install
Just extract the file and run the .EXE file, like everything else.