The Facebook-led plan is for a two-minute silence to be held in Glasgow's Royal Exchange Square.
Nearly 4,000 have indicated they will attend the memorial, which is planned to begin at 2.30pm outside the Gallery of Modern Art in the square.
The tragedy unfolded on Monday as shoppers filled the streets ahead of Christmas.
An out-of-control bin lorry hit pedestrians in the city centre, as it careered from Royal Exchange Square to George Square.
The incident claimed the lives of six people, while 4 others remain in hospital.
The victims of the crash were also remembered at Christmas services across the city, with candles lit and prayers said for all those affected by the tragedy.
Jacqueline McQuade is thought to have gone to withdraw money from a cash machine during a Christmas shopping trip when her 18-year-old daughter Erin McQuade and parents Jack and Lorraine Sweeney, all from Dumbarton, were fatally injured.
Primary teacher Stephenie Tait and tax worker Jacqueline Morton, both from Glasgow, and Gillian Ewing, from Edinburgh, were also killed when the council truck mounted the pavement before crashing into the side of the Millennium Hotel in George Square.