The recently launched guidance UK Government published on its website, may be helpful to artists and organisations as and when consideration to touring in Europe resumes.
There will likely be additional costs and administration to consider now that the UK has left the EU. We would strongly advise that you research the documentation required to travel and ensure it is in place and, if required, that you have sought the relevant professional and legal advice suitable to the aims of your travel.
As a starting point, please take note of the following link to the recently launched sector-specific touring gov.uk landing webpages which offers guidance to support working in Europe now that the UK has left the EU. There are sector specific pages found through the following link. This area of work is in development with further pages to be added.
Touring Europe - checklists for the arts, cultural, creative, and heritage sectors