Your meeting page is at your own address, made from your handle: yourhandle.magpie.diy. Your meeting types are on it too, with your public calendar at /calendar and your podcasts at /podcast. Meetings and each podcast's settings show the new addresses to copy.
Links to these pages shared before the change go to the same page at the new address. Podcast feeds keep their addresses, so podcast apps need no change. Your talk page stays at magpie.diy/talk/yourhandle.
New handles use lowercase letters, numbers and hyphens.