A particular word for after death get together?

Solution 1:

In the US, we have a "memorial service" that occurs after death and sometimes instead of a funeral. For example, if the deceased is cremated, instead of a funeral service that includes an automobile processional to the cemetery, a memorial service may be scheduled where the family and friends can gather to honor the deceased. It can be very formal with a religious service and music, or just a eulogy and pictures or slideshow of images of the deceased. The memorial service may or may not include a luncheon afterwards.

Solution 2:

I would call this a wake, which is the get-together held after a funeral.

Different cultures have different customs: in the UK it can actually be difficult to arrange a funeral, with the result that there may be a space of as much as three weeks or more between the death and the service. The wake is invariably after the funeral.

Wake does also refer to "A watch or vigil held beside the body of someone who has died, sometimes accompanied by ritual observances," [Oxford] but as religious observances become less common, this meaning is becoming less common too. Even if a death is accompanied by such a vigil, the get-together after the funeral is also a wake.