Millennials came to the Jonas Brothers concert Saturday night at Moda Center ready to party like it was 2005. The Jo Bros swung through town Sept. 20 on their “Greetings From Your Hometown” tour, the boy band’s 20th anniversary of making music together. The crowd pogo-jumped to the beat of “Year 3000,” they swooned to the bros’ first No. The dialogue was scripted, except for a part where Joe interacted with fans and read their signs aloud. Pop music is a business and the bros now have a lot of mouths to feed, with five young daughters among them.