The memorial service is not about your father. If you are lucky it will be given by an elder who knew him well and is willing to talk about him as a person. However the memorial service is just an excuse for them to preach their religion and the person is very much overlooked. The time is deliberately short to prevent the elder straying from the approved text.
I have been to some memorial services that the elder given the talk got the deseased name or personal info wrong or you can tell they just read it off a piece of paper. When it comes to their sales pitch they know that BS off by heart.