Yesterday was the LEGO Stranger Things event at the Flatiron and Leicester LEGO Brand Stores and if you attended, there was also a building event for a make and take for the Castle Byers build. A user on Reddit has provided the building instructions for Castle Byers but the stickers are exclusive to that set. The parts needed for the build are as follows:

2x 4114026

1x 4243815

1x 4516843

2x 6016172

1x 4530712

2x 4211183

4x 4211180

4x 4211181

11x 4538252

1x 4243838

5x 4211525

1x 4541978

2x 6011817

1x 4210660

8x 6167700

2x 6268815

The LEGO Stranger Things The Upside Down (75810) is now available for purchase for VIP members for $199.99. It will be available to the general public on June 1.