• London’s annual, month-long celebration of the River Thames, Totally Thames, has kicked off and this year’s program includes everything from concerts in Tower Bridge’s bascule chamber to the largest ever exhibition on mudlarking and a mass boat regatta at the end of the month. The programme includes more than 100 events stretching over 42 miles of the river as it winds through London, covering everything from art installations to heritage-related walks and talks, family-oriented offerings and the chance to get out on the river itself. Other highlights include the Rivers of the World Retrospective art exhibition, a scented heritage exhibition –The Barking Stink, a heritage walk through riverside Rotherhithe, open days at the RNLI Tower Lifeboat Station and this weekend’s Classic Boat Festival at St Katharine Docks. Many events are free. Runs until 30th September For the full programme, head to https://totallythames.org/. PICTURE Courtesy of Totally Thames.

• London’s grand building plans that never went ahead are the subject of a new exhibition opening at the Guildhall Art Gallery tomorrow. The London That Never Was imagines a city where the Tower Bridge is clad in glass and where a colossal burial pyramid looms over Primrose Hill. The free exhibition can be seen until 8th December. For more, head here. (To see some of the projects that were never built, see our previous series, 8 structures from the London That Never Was).

• A new garden celebrating the evolution of plants has opened at the Royal Botanic Gardens, Kew. The Agius Evolution Garden is divided into eight sections to form “garden rooms” with each room containing closely related plants, revealing fascinating stories such as the connection between strawberries and nettles and why the Asteraceae family have “false flowers”. Admission charge applies. For more, see www.kew.org.

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