Disclaimer: Practices all vary; some ppl do rituals or blessings prior to invitations but usually this is in reference to inviting ppl during nighttime
Symbolism
Salt is a basic layer for protection. In the example given on how salt is used; it is a time to ward off negative energies, evil spirits and impurities.
Now, in rituals, the salt helps with grounding and creating a symbolic boundary between spaces.
Additionally, salt is also used for purification and as a cleansing bath as well.









