@splicer yeah, I think there's a real spectrum. Also in North American secular culture, we have other practices like: memorials and statues; named holidays; use of surnames or family names; naming children after family members; "what the founders intended"; family recipes; family traditions; genealogy; inheritance laws; historical reënactment.
I think drawing a clear line between these and other practices elsewhere might be hard.
@evan The section on North America seems to include visiting gravesites and memorials, in which case my "strong no" vote was an inaccurate response. However, I don't see pausing to reflect or keeping a photo of someone who is gone in the same category as keeping an altar, making offerings, or ritualized exhumation and reburial of a body. Maybe I should; it's not something I've given much thought to before now.