The April 2018 LEGO Brand Retail Store calendar is now out. From April 1-15, you can get a free exclusive LEGO Minifigure Factory set with purchases of $75 or more. From April 13 to May 3, you can get a free LEGO Darth Vader Pod. Aside from these promotions, there aren’t too many other worthy items of mention.
They do have a VIP Monthly Mini Model Frog build that we mentioned earlier. There is however a LEGO Life Meeting on April 21 and 28 where you can build the Monthly Mini Model Frog build and participate in other creative activities. You can check the full LEGO Store Calendar here.