The procedural hearing will take place at the High Court in Edinburgh later on Wednesday.
The First Minister's spokesman said she remains 'committed' to holding a vote this year.
Holyrood backed the Referendums (Scotland) Bill at its final stage by 68 votes to 54.
The First Minister has called for the Prime Minister to 'agree and negotiate' the transfer of powers to Holyrood to hold indyref2.
The First Minister will invite people in Scotland to come together to back another referendum.
Labour councillor Alison Evison will speak at the Local Government Association conference.
Nicola Sturgeon has told the PM he can't 'bludgeon' Scotland into seeing the world the way he does.