We have a guest constructor this week, whose puzzle is 2/5 in difficulty. Solve to determine the author!
Meanwhile, the subscription drive appears unlikely to reach 100 by June 15, so a single-author 21x looks unlikely for now. However, we came up with an alternative that we think you'll enjoy a lot. If all goes well, we'll have it ready for next week. (At latest the week after that). This bonus puzzle, as ever, will be free to subscribers, and so will entry into the attendant contest.