Alex Salmond is set to address a major pro-Scottish independence rally in Edinburgh.
Thousands of people are expected to descend on the city for the march and rally supporting a Yes vote in the 2014 referendum.
The SNP leader will join Independent MSP Margo MacDonald, leader of the Scottish Green Party Patrick Harvie and more than a dozen other speakers at the event.
The March and Rally for an Independent Scotland, which is not part of the official Yes Scotland campaign, will see supporters gather in the Meadows from 11am on Saturday before heading to Princes Street Gardens.
Comedian Hardeep Singh Kohli, lawyer Aamer Anwar and writer Alan Bissett will attend along with representatives from groups including Scottish CND, Young Scots for Independence and Citizens Against Public Service Cuts.
Organiser Jeff Duncan said the number of coach seats booked suggested thousands of people from across Scotland are likely to turn out, with many more expected from Edinburgh itself.
Mr Duncan said the event is the first of three rallies, with another planned for this time next year and the biggest set for September 2014.
Mr Salmond said in a statement on the event website: "The March and Rally in Edinburgh is another important step on the road to completing Scotland's home rule journey and I look forward to seeing you all there."
Ms MacDonald added: "Forget the partisan posturing. Get there and stand four-square with other independently-minded folk."