How could I show 4 different categories on the portfolio page – for example I want to have line that says Events and then portfolio of Events and line that says Classes and Seminars with portfolio underneath etc.?
Currently there isn’t a known way to do this just yet. The only way I know of is to manually add the html code itself.
You can also have multiple (separate) portfolio pages based on category.
If you need a portfolio with a lot of features and options, I’d recommend searching WordPress for a plugin that can handle what you need. I don’t know of anything specifically, but I have seen plenty of Genesis users who implemented different portfolio/gallery plugins to do what you’re referring to.