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
During the weekend visitors will be able to tour the house, enjoy music and theatre productions in the gardens and take part in family-friendly activities.
10am to 5pm
Twickenham

The Rickmansworth Festival celebrates canals with at least 100 boats attending, the community and the environment.
10:30am to 10:30pm
Rickmansworth
Admission to Kempton Steam Museum. See an array of petrol engines and model steam engines from across the ages.
10:30am to 4pm
Feltham

Annual open day at the cemetery with visits to the chapel and crypt – not usually open – guidance on family history.
11am to 5pm
Peckham

Watch teams of watermen who will steer huge barges up the Thames from Greenwich to Westminster.
12:30pm to 4pm

Acclaimed artist Brian Bolland will be signing Judge Dredd By Brian Bolland: Apex Edition at Forbidden Planet London
1pm to 2pm
Soho

Top events in London on Sunday
Weather permitting, there could be up to 50 hot air balloons drifting over Central London just after sunrise.
Starts at 6:30am

During the weekend visitors will be able to tour the house, enjoy music and theatre productions in the gardens and take part in family-friendly activities.
10am to 5pm
Twickenham

The Rickmansworth Festival celebrates canals with at least 100 boats attending, the community and the environment.
10:30am to 5:30pm
Rickmansworth
Admission to Kempton Steam Museum. See an array of petrol engines and model steam engines from across the ages.
10:30am to 4pm
Feltham

£10.00
Visitors are able to explore both the Gardens and parts of the Mansion, including the Stables and cellars, at their leisure.
11am to 4pm
North Weald


This steeply, sloping garden comprises woodland walks, filled with flowering shrubs and ferns.
2pm to 6pm
Wimbledon

Visit a series of seven floating barge gardens connected by walkways and bridges.
2pm to 5pm
Southwark

What impact has two decades’ worth of policing and counterterrorism had on the state of mind of Muslims in Britain?
3pm to 4:30pm
Holborn