Events which are dressed for

Hello, everyone!

I have following sentence;

"... Rituals, ceremonial occasions marking significant events such as weddings, graduations, and important holidays, are often events which are dressed for, where categories considered important by a society are visually displayed for all to see and appreciate. ..."

Regarding the above clause - "are often events which are dressed for",

1. I can't understand the construction of relative clause. Which analysis is correct? ;

a. in my opinion the subject 'people' should be put between 'which' and 'are dressed'.

b. the clause has no mistake and stands grammatical, while the subject 'people' has been omitted and everone can guess it.

c. the clause has no mistake and stands grammatical, while the antecedent - 'events' has been passivized as per the case "The bed is slept in by him" (some intransitive verbs take what linguistscall 'prepositional objects'. These objects are available to be promoted to the subject position in creating a passive voice construction).

2. Re above 1.c, do you agree the strucure - "events which are dressed for" has the same one with "The bed is slept in by him"?

Waiting for your kind reply and thanking in advance,

Best RGDS