Inventing puddings and planting trees are just some of the things Britons are invited to do for Queen Elizabeth's Platinum Jubilee, events to mark her 70th anniversary on the throne that culminate in a "blockbuster weekend of celebrations" in June.

The 95-year-old, the longest-reigning monarch in British history, will add another milestone when she marks her Platinum Jubilee in February, with the government planning four days of celebrations from June 2-5...