Yes, strange as it seems, there is such a thing as a gerbil show. It's basically like a cat or dog show, except for the fact that it's about gerbils.
WARNING: Gerbil shows can pass diseases from gerbil to gerbil. Even though there are health inspections, the sickness can still get through occasionally. E. coli is the worst.
The AGS and the NGS (see Gerbil societies page) hold several gerbil shows a year.
Info on AGS shows here
Info on NGS shows here and here
If you need more info, feel free to email me!