On the first Saturday of every month Home Depot organizing building event for the kids. We like it a lot, girls are enjoying building stuff there and playing with it at home later.
This is all completely free. Sometimes you get 1 item to build, sometimes 3. All depends on the day and time you come.
In this post I combined our visits for the past few months.
In April they made Flower pot with chalk board
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In May they made picture frames