Most of the time, literally nobody will show up. So, you'll pay your respect to the deceased using a short speech that is based on the information provided (which is usually pretty scarce, like: "found abandoned, identified, but no next-of-kin responded") complemented with Google and your imagination, and that's about it.
Then, there are the occasions where one or two people will attend. These are usually the hardest: you have to make clear that you don't actually know the first thing about the deceased, other than what Google told you, and that might be ENTIRELY wrong, but still have to deliver a coherent eulogy. Poems work best for these situations, and sometimes talking to the visitors is quite revealing as well.
And then, there are surprises, like a room full of people turning up, and you being able to elicit stories from family and friends, and basically having a regular funeral. But I admit that happened once in like the past decade or so.
Anyway, I think it's important that nobody is left to their final resting place without witnesses, and I also find avoiding that is a good way to engage with your community...