Exodus 12:14, Exodus 13:8-9, Joshua 4:6-7, Acts 2:42, Joel 2:15-16
Rituals are procedures or routines that are fused with meaning. Ritual actions include various rites of passage (birth, marriage, death) or calendrical rites (religious holy days, national holidays), ...
As sensitive and broad-minded humans, we must never allow ourselves to be in any way judgmental of the religious practices of other people, even when these people clearly are raving space loons.