The current Venezuelan constitution says the following:
El candidato elegido o candidata elegida tomará posesión del cargo de Presidente o Presidenta de la República el diez de enero del primer año de su período constitucional, mediante juramento ante la Asamblea Nacional. Si por cualquier motivo sobrevenido el Presidente o Presidenta de la República no pudiese tomar posesión ante la Asamblea Nacional, lo hará ante el Tribunal Supremo de Justicia.
The last part states that if the presidente could not take office before the National Assembly, he or she shall do it in the presence of the Supreme Court of Justice.
Now, we know the Supreme Court of Justice is just a bunch of Chávez's puppets. My guess: they could simply do as if they were going to Cuba in order to guarantee the farce goes on.
Today military honcho Cabello declared Chávez could postpone the formal event of term inauguration...just an idea for the Supreme Court...in the same way as Chávez himself used to "give ideas" to it.