I'd like to weigh in here, We should honor the sanctity of the place out of respect of the families of the deceased, even moreso if the place contains those we don't know, as we do not know how that person's family wishes us to honor their beloved's memory. If it is someone whom we personally know's gravesite, then we can honor that person how that person wanted us to remember them, even if it involves a party, but do be mindful of other people grieving, but also do not be afraid of inviting them over to honor the memories of their beloved.