Well, that didn't take long. I made a mental note yesterday to post something about Microsoft's annual developer conference being open for registrations, I check again today and it's already sold out. At $2000+ per ticket this is somewhat amazing, though do remember that the vast majority of attendees will be there courtesy of their employers. As with Apple's and Google's annual shindigs, the early access to training and all the networking makes this a good investment for all, no doubt. Build 2017 is in May and the highlight will be demos of (and early access to) Redstone 3 in all its device forms.
Microsoft sold more than 5000 developer tickets, so it's a big (and self-funding) event. As the graphic shows, Build 2017 is on May 10-12 2017 and is in Seattle, WA this year.