Adele’s 10th and final show at a huge custom-built outdoor arena in Munich is set for Saturday night, ending the only European concerts the British megastar will give this year. Hundreds of thousands of fans have flocked to the Bavarian capital since the singer’s residency began on August 2. The “Rolling in the Deep” and “Hello” singer has held two shows per week at the Adele Arena on the city’s trade fair grounds. The temporary venue, which was customised to her needs and features a 93-metre-long catwalk, has a capacity of 74,000 people. Adele – who is notoriously reluctant to go on tour – la…