when we aren't doing ritual then yes, we do meet in a public place (or in a room that the blinds need to be drawn).
ETA: AOII does NOT have a ritual specifically for alumnae - other than the open ceremonies and memorials perviously mentioned.
There actually is a special ritual for alumnae...just read it the other day...it only differs by paragraph, but it is different all the same. Check the ritual book!
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AOII
One Motto, One Badge, One Bond and Singleness of Heart!