As to the question of rules regarding when and where peaceful protests may be held, that's highly dependent on the specific location of the protest.
The venturi mask, also known as an air-entrainment mask (and sometimes by the brand name VentimaskÂ®), is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy.
Miraak's Mask is the face of a Seeker. The light and heavy versions of the mask share the same statistics, except for the lowest level versions of each which differ slightly in value and enchantment power. It is the only mask to have a unique design besides Konahrik.