The Grand Conjuction between Saturn and Jupiter happens every 20 years and is usually hearalded by a signiture event before or after the conjunction happens.  This conjunction is part of a larger 200-year cycle, where the Saturn/Jupiter conjunction take place in a sign that shares an elemental connection (Earth, Air, Fire, Water).  For the last 200 years the Grand Conjunction has taken place in Earth Signs (Taurus, Virgo, Capricorn) and now that cycle changes to Air signs (Gemini, Libra, Aquarius) starting with Aquarius on December 21, 2020.