Short-term mobility
Article 20
1. Where a third-country national who holds a valid EU Blue Card issued by a Member State that applies the Schengen acquis in full enters and stays in one or several second Member States for a period of 90 days in any 180-day period for the purpose of carrying out a business activity, the second Member State shall not require any authorisation for exercising such activity other than the EU Blue Card. 2. A third-country national who holds a valid EU Blue Card issued by a Member State that does not apply the Schengen acquis in full shall be entitled to enter and stay for the purpose of carrying out a business activity in one or several second Member States for up to 90 days in any 180-day period on the basis of the EU Blue Card and a valid travel document. Where the EU Blue Card holder crosses an internal border for which controls have not yet been lifted into a second Member State that applies the Schengen acquis in full, the second Member State may require the EU Blue Card holder to provide evidence of the business purpose of the stay. The second Member State shall not require any authorisation for exercising the business activity other than the EU Blue Card.