Want an alien space ship? A green screen set? Glowing eyes?
Well, some of these may even be possible within the timeframe!
Having worked on a number of weekend film competitions before I can say from experience that decent VFX is very difficult to pull off in a weekend (requiring a lot of coordination, planning and energy drinks), but they can open up new avenues for creative storytelling.
I can do 3D Modelling/Texturing, rigging, some animation, rendering and time/sanity permitting, Colour Grading.