For me it depends. For fun (ie. not paid jobs), I'd shoot primes to satisfy interest. Typical 'normal' focal length will be either of these lenses : 24mm, 28mm, 35mm (K5; so its APS-C).
I prefer the 35mm for its FL,lack of distortion, sharpness, speed and DOF control. The 24mm is a bit short at times and so can be a bit (in your face), but at dinner tables, it is easier to take it all in.
All in all, you just need to be familiar enough with the FL you are using so that you can tackle the situation as best as possible if there is no chance to change lenses.
Switching lenses can be a pain in the middle of an event, so very often the longer FL lens like the 85mm will not be mounted until I know that the event is transitioning or has moved on to another pace or focal length need (eg. Move from Tea Ceremony to guest hosting; Move from dinner reception to individual portrait shots of each guest (DnD); etc)
That is why some photographers have a 2nd body.
My few cents