It is the first rally since First Minister Nicola Sturgeon said last month that she would introduce new legislation to stage a second independence referendum by May 2021, the end date of the current government in Holyrood.
[...]
Sturgeon's Scottish National Party (SNP) is campaigning ahead of the European elections later this month on a "Stop Brexit" platform, in a bid to reinforce Scotland's support for staying in the EU. The SNP is expected to win three or four of Scotland's six seats in the European Parliament, with Labour and the Conservatives taking one each.
[...]
Permission to vote

The devolved government in Edinburgh cannot hold a referendum without being granted the powers to do so by the Westminster government in London.