stadium combines a retractable roof with a grass surface. This caused some problems in the beginning: the turf's grass would not grow in the shade of the open roof and had to be replaced up to four times a year. Exterior renovation In September 2015, plans were presented to renovate the stadium's facade. The renovation should provide better quality and service to visitors by widening the walkway rings around the stadium, creating more room for the visitors and for new facilities (the number of seats remains the same). As a result, the outside of the stadium transforms from a concave shape to a convex shape, drastically altering its appearance. The renovation was completed in 2020, when four matches of the UEFA Euro 2020 championship were played in the Arena. Construction works started in June 2017. The first phase is to renovate the east side of the stadium, where construction of the new facade was completed in April 2018. Name change On 25 April 2017, it was announced that the Amsterdam Arena would be renamed to "Johan Cruijff Arena" in memory of Ajax legend Johan Cruyff. Later that year, on 9 August, it was stated that the name change would take place on 25 October 2017. However, this was postponed as that date proved to be infeasible due to the many matters that needed to be settled, such as arranging compensation for possible loss of income, transferring part of the shares from the municipality of Amsterdam to Ajax and having a discussion with the Cruyff family. On 5 April 2018, it was announced that the stadium would officially change name at the start of the 2018–19 football season. The stadium's new logo was revealed on 25 April 2018, the birthday of Johan Cruyff. According to the spokeswoman of Cruyff's family, the original Dutch spelling of his name (Cruijff) was chosen for the stadium's official name "to stay close to the Dutch Johan". The 2018–19 football season started in August 2018. Building and facilities The stadium's original architect is the Dutchman Rob Schuurman. The original all-seated capacity was 54,990. After the 2019-20 season, but before Euro 2020, capacity was expanded by 660. The final increased capacity after the 2017-2021 renovation project is 56,120, an increase of 1,130. The original capacity during music concerts – the stadium's maximum capacity – is 68,000 visitors. The parking capacity of the Transferium is 500 cars (inside);