Natti and Takki — two local DJs also known as Natalie Palmer and Andressa Uyetaqui — will be taking the stage as headliners at Belly Up Saturday, Aug. 22, for the first time since starting their careers. Originally from South Africa, Palmer was involved with music in college before moving out to Aspen as an orthopedic physician assistant. But, during the COVID-19 pandemic, she found herself exhausted in the medical field and began teaching herse…