The start date for the summer tour of American Idol has not been announced yet. I recommend checking the American Idol website or following them on social media for the latest updates on the summer tour.
2. Top 10 or 12 on American Idol:
As of my knowledge cutoff date in September 2021, the American Idol season 20 finale had not aired yet. Therefore, I do not have information on whether there were 10 or 12 finalists in the top ranks. To get the most up-to-date information on the results, I suggest visiting the American Idol official website or reputable entertainment news sources.