Please, RSVP by February 20th.
Yes, register for an E-Visa here: https://evisa.gov.vn/
The easiest way is to download the Grab app. It's the affordable Uber of Vietnam. https://www.grab.com/vn/en/transport/taxi/
If you're a first time traveler, I highly recommend seeing your doctor and ask for a care package and update your vaccinations. Please, also research on prohibited items.