I do feel for you OP, as someone who lost their parent last year and who could have exactly 6 of us at the funeral. Mum and Dad came from big families - I have over 20 cousins and they all have children who thought the world of my mum. But 6 was all we could have. Mind you, we were 'lucky' as mum died just before the Covid lockdown and not from Covid so we were with her. My sisters and I couldn't even hug on the day or go within 2 metres of each other and there was no wake afterwards.
Another member of the family died recently and she had 30 people at her funeral - no official wake but people from the funeral gathered in the garden of a local pub and there was an on line option for the service which we didn't get with mum as it wasn't brought in at the time. 6 or 30 it's still an incredibly sad time.
BUT, DH and I were talking about weddings the other day. I said I wondered if we'd have postponed our wedding if we'd married during Covid. Our guess was that we'd have gone ahead eventually but probably would have postponed first time round. When you start planning, you have a vision in your head and it's hard to shake it off.
Yes, the wedding industry is geared up to make you spend money on one day. Yes, we can all do without the dress, the meal, the bridesmaids (my aunts married during the war and wore their best dress - DHs off to fight within a few days or a couple of weeks at most). But if you've planned a day, you want that day. Wedding, funeral, kid's Christening or a special birthday. It's hard to have to put that all aside.
Yes, of course, a funeral is 'that day' and that's it. Yes, a wedding party can be held later and many will do that for future anniversaries. But I get where you're coming from and, as I said to DH the other day, he and I had our big day, big dress, expensive suit, bridesmaids and 100 guests. I have no idea how I would feel in your circumstances as I've not had to face all the endless changes. As someone said on the radio this week, it's not just rebooking a day and letting everyone know. It's then trying to make sure all the suppliers can do that day, and with weddings booked years in advance, that's not always doable.
From our point of view, as a huge extended family, we're planning a big get together some time in the future and, at that, we'll remember mum and the other members of the family we've lost since March 2020. We'll talk about them, laugh about them, raise a glass to them and enjoy our day together as a family again.
I hope you enjoy your day. It will be special, every wedding is, it just won't be what you planned and that takes getting used to.
I totally agree with @IncyWincyGrownUp - the risks taken in certain areas of life seem very oddly skewed at the moment.