Scientists for EU are promoting the march for a People's Vote:
https://www.peoples-vote.uk/march
On their website, they say:
New facts have come to light about the costs and complexity of Brexit that no one could have known at the time of the referendum.
Promises made by politicians about Brexit, like more money for our NHS, are not going to be kept.
The Brexit process is a complete mess and the negotiations are going badly, which makes it more likely that we will get a bad deal.
The Westminster elite is making a mess of it.
If any alumni are interested in going, we could meet and walk together.
