Hi Larry,
In short, yes! I think there are a few really great options depending on exactly what you are looking for.
We have a Filter Bar plugin that adds flexible category filtering options and can be presented at the top. You can see it in action on our demo site.
If you are mostly looking for the ability to view single categories at once, you might want to check out The Events Calendar Category Colors, which is a 3rd party plugin that adds a simpler list of categories at the top.
Finally, if those options don’t provide exactly what you need, a bit of custom CSS should do the trick!
Will those options help?