The IanVisits guide to free and cheap lectures, trips, heritage events, organised tours and other random miscellany happening around London this weekend.

Top events in London on Saturday

Five gardens in a housing estate only open to the public through the National Garden Scheme.
10am to 4pm
Visit a garden - Hyde Park Estate Gardens (Paddington)

Online events / webinars

A talk about the oldest botanic garden in Britain, now in its 400th year.
10:30am to 12pm
University of Oxford Botanic Garden - 400 years of gardening and botany
Get a taste of the Royal College of Physicians fascinating 500-year history and award-winning architecture in a live virtual guided tour.
1pm to 1:30pm
RCP live virtual guided taster tour
Museums are full of the belongings of the dead! Come and see some remarkable objects and hear some incredible stories.
7pm to 8:15pm
Death in the British Museum

Top events in London on Sunday

One of London's prettiest secluded garden squares with a romantic rose tunnel that winds through the middle of the garden.
10:30am to 4pm
Visit a garden - Edwardes Square (Kensington)
A 70ft garden with trees, evergreen structure, perennial flowers and grasses.
12pm to 5pm
Kingston Upon Thames
Visit a garden - 7 Woodbines Avenue (Kingston-upon-Thames)
This 100m-long unique and award winning garden is home to the Corokia National Collection along with a great number of other unusual plants.
1:30pm to 5:30pm
Muswell Hill
Visit a garden - 33 Wood Vale (Highgate)
Front gardens in this pretty cobbled cul-de-sac of terraced houses, overlooking Thornhill Road Gardens in the heart of Barnsbury.
2:30pm to 5:30pm
Visit a garden - Malvern Terrace Gardens (Islington)

Online events / webinars

Mike Jay is the author of Mescaline – a Global History - A definitive history of mescaline that explores its mind-altering effects across cultures, from ancient America to Western modernity.
8pm to 10pm
Mike Jay on Mescaline & Art