andthePlatinumPageant, a liveconcertinfrontofthepalace, featuringmusicanddancing, puppetsoftheQueen's favouritepets, hercorgidogs, and a performancebyEdSheeran.
There's a traditionofinventing a newfooddishtocommemoratejubilees, goingallthewaybacktotheVictoriasponge, a cakenamedafterQueenVictoria.
Thisyear a competitionwasheldtofind a newdishtobecometheofficialpuddingofthejubilee.
Here's BBCreporter, DaniellaRelph, toexplainmore.
First, therewastheVictoriasponge, thencoronationchicken, nowwehave a QueenElizabethIIPlatinumPudding.
ThewinninglemonSwissrollandamarettitrifleis a twiston a traditionaltrifle, withlayersofSwissroll, jelly, custard, mandarins, amarettibiscuitsandcream.
In 1953, a mixofchickenandcurrycreamsaucecalled, coronationchicken, wasinventedtocelebrateQueenElizabeth's coronation, theceremonyatwhichshewasmadequeen.
Thisyear, competitionwinner, JemmaMelvin, hasinvented a lemonandSwissrollamarettitrifleastheofficialjubileecake.
Trifleis a sweet, coldpuddingmadeofthreelayers a layeroffruitandcake, a layerofcustard, and a toplayerofcream.
Jemma's jubileetrifleis a twiston a traditionaltrifle.
Whentalkingaboutfood, peopleusethephrase "a twistonsomething" todescribe a newvariationof a traditionalrecipe, usingdifferent, excitingingredients.
Althoughthepuddingcontainsingredientslikeamarettibiscuitsandcream, whicharegoodenoughfor a queen, shewantedtobaseiton a humbletrifle, somethingeveryonearoundthecountrycanmake.
Enjoying a bowlofJemma's PlatinumPuddingsoundslike a greatwayforsometocelebratetheQueen's seventy-yearreign.
Whichremindsmeofyourquestion, Neil.
WeknowElizabethIIhasreignedfor 70 years, butwhowasthesecondlongest-servingmonarch?