Looks like it’s a COVID thing? From their website:

Visits in Washington D.C. Because of new Covid regulations in DC, we need a permit for each visit. We request this permit from the DC health department and they asked us to send the submissions 2 weeks to 1 month in advance. They also mentioned that the address submitted is the location where the alpacas will be allowed to visit. Meaning, we have to be at the exact address that we request on the form. We cannot make any last minute changes in location. There will also be an investigator at the site to greet us and to make sure the animals are in great health. They are always very nice, so worry not!