The arctic crossing is usually once a year and very popular. I had the one for 2023 on the Serenade ending in Boston booked and then Royal went and cancelled it. Looks like they aren’t doing one in 2023 that ends in Boston. Celebrity had something similar where they had one sailing from Bayonne to Iceland and then Iceland to Boston, but the pricing was really high when I looked at it. There are some good deals on transatlantics, but the suites and the most desirable cabins don’t last long. If you’re looking for something special watch the deployment threads here and jump on it as soon as it comes out.