The date for the developer conference Microsoft BUILD 2018 is fixed. The Build 2018 will take place in Seattle from May 7 to 9, 2018. WalkingCat posted the corresponding information including the Build 2018 logo on Twitter.
— WalkingCat (@h0x0d) 6. Februar 2018
It should be noted that there is an overlap with Google I/O 2018 (see Google I/O May 8th to 10th 2018).