Mona Hatoum goes hammer and tongs with Giacometti, Andrew Geddes is revealed as a pioneer and Saint Nick rocks up four months early – all in your weekly dispatch
Encounters: Giacometti x Mona Hatoum
Second in a sparky series of shows comparing sculptors of today to the 20th-century legend who captured the slender survival of the human spirit in spindly simplified figures.
• Barbican, London, 3 September to 11 January