It seems that here in New Zealand things are done very differently.
When arranging my parent's funerals, the first port of call was the Funeral Director's. They then make all arrangements, including flowers, organist, remembrance sheets etc, and they usually have an adjoining room where the overflow of people (if any) are housed, watching the proceedings via a video link. This room is then used to serve light refreshments which you can either supply yourself or have catered. I was fortunate that in both cases my Inner Wheel Club provided the sandwiches and helped serve the cuppas. We provided the cakes and savouries. Very few services are now held in Church now, as the Funeral Homes are providing such a good service, but many have a Religious leader (Vicar, Minister etc) officiating. It is unusual to have a funeral any later than a week after the person has passed away.
We set Mum and Dad's funerals for a Saturday, as this suited US, not necessarily those attending,
I'm not saying that this is only way to do things, but it worked for us.
Hope things work out for you, and I'm sorry that you are having additional stress at this sad time