The difference between a wedding and a funeral?
Well at a funeral people walk past a hearse, church and funeral cortège without even raising their heads or making eye contact with anyone involved. Maybe a show of respect or acknowledgement of the solemnity of death.
A wedding dress and best bib and tucker (with button hole) perhaps attract the good memories of family occasions, while a black clad gathering has the opposite effect.
A wedding – passers by stand and stare or just stand and smile – in a dream-like state.
Perhaps it is easier to be happy with someone than mourn with them.