How much capacity sd cards with nikon d5100?

How many pics will 2gb, 4gb, 32gb.etc… Hold? & videos on a Nikon d5100?
I'm photographing and event

Depends on the quality of photos and video.
This data is in your manual or kust look at the dispaly of the camera and it will tell you the remaining capacity.
If you can fit 500 shots on a 4GB card then you will fit 8 times that on a 32GB - 4, 000.

It will depend on the image format and quality (RAW, large/medium.small JPEG).

If you read the manual that came with the camera it will tell you the size of the different formats/quality. Also, the manual explains how the camera will give you a rough estimate of remaining shots.