Oh My Girl couldn't enter the USA and neither can you - a quick primer about performing visas

It's rare that an opportunity for me to drop a post about something extremely topical comes up, but occasionally k-pop will throw me a jewel like that and here one is.  K-pop girl group Oh My Girl had some visa issues recently when attempting to enter the USA and since touring headfucks is an area in which I'm uniquely qualified having managed many of them personally, here is now a quick, helpful trufaxual post for your entertainment and education!