Ash Wednesday is in five days and starts Lent. Have you ever noticed that many people observe Ash Wednesday and Lent who aren't even regularly practicing Catholics or Lutherans. I think this is an indication of how deeply meaningful these rituals are.
Things like Ascension Thursday, the Feast of the Assumption, the Feast of the Immaculate Conception, though important, haven't reached into the average human psyche to touch us deeply. There are no sacramentals, they are not closely associated with a season, so it is only the obedient or the spiritually attuned who observe those Holy Days.