Hello there,  so sorry to hear about your mum. What a lovely idea.

a friend of mine was in a very similar situation last year. Her father was terminally ill.  She and her fiance had a “Celebrant” come  and perform a non-religious wedding service in the garden.   They ordered  food from Marks & Spencer‘s, I think also the wedding cake came from M and S. Friends got involved with flowers and a couple of brothers did a barbecue . So her father got to see her in her wedding dress, surrounded by close family and friends , None of the stress of organising a huge affair, much quieter, much more intimate and much easier to organise -  I think they had it sorted within three weeks.

 I hope that helps

Ruth xxx