There was a question?
Better go back, have a look, and try to be sensible. Harrumph.
If you can add categories
without unduly increasing admin workload, ie most of it being automatic, ( Tickboxes?) then yes, it must appear to be useful. Let's say somebody wants disco and karaoke, then it saves them contacting six DJs who don't offer it. That's the theory.
OK, a list of features ( but once started, where do we stop?):
Functions- 18ths, Weddings, Corporate.
Ages catered for- Under 11, 18ths, 50th, etc. This could perhaps be incorporated into Functions.
Photobooths, Dancefloors, Silent Disco, Karaoke, as said above.
PA hire, Equipment hire.
That's me out of categories.