A funeral notice announces a "mass of Christian burial" (at a Roman Catholic church in the US) followed by a burial followed by a luncheon. As an outsider I have a few questions about what to expect:
Is the mass the same as a Sunday mass with extra stuff added, or is it different? What content is unique to a funeral mass?
What happens at the burial beyond putting the casket in the ground? (In movies you always see what looks like another religious service there, but I don't know if that's accurate.) If there is a service of some sort, how does it differ from the mass?
Where is the eulogy given (or does that vary)? Will visitors be asked to say something about the deceased at one of these services?
Is it practical to skip the mass1 and go to the rest, or would that be "weird"? If it's practical, approximately how long after the announced start time for the mass should one show up to proceed to the cemetery?
What are the cultural/social norms around interacting with the mourners? Are there specific things you should (or shouldn't) say or do, beyond what common sense suggests? For example, in Judaism we have a specific phrase of comfort that we say; is there anything like that?
Are you supposed to bring a dish to the luncheon?
1 Because participating in, or appearing to participate in, another religion's service can be problematic.