How does the reservation request process work? What are the busiest and slowest times for requests? When should I mail in the request for the 2019 season?

Check out thelostkitchen.com for the detaios, the process is super specific.

Reservations are done by mailing a postcard. Erin accepts postcards that are postmarked NO EARLIER than April 1. She then accepts them for a month. Then she uses a lottery to pick them. You need a fair amount of luck to get reservation. The demand is quite insane.

And wait for announcements on social media.