Maby you should do a new calendar for each year,which features certain quotes from members or their pictures or a couple of lines highlighting groundbreaking science and technology from that specific year.You could then pin it up anywhere in your home and as time goes on visitors(especially those such as long-distance relatives or new friends) may see it and admire it and then become more interested in the site,ask questions on the spot and even decide to join up and become members themselve.Another idea is to sell bookmarks so you can always be reminded of ImmInst and its members when your reading the latest science and futurist book or away on holidays somewhere else.
