We've had some great luck with arriving on site just as some great action is happening. Usually we try to stop by after preschool, and on "footer" day we showed up and saw this:
footer forms were in, complete with rebar, and there was even a tag on
the caution tape that inspection had already taken place. Within about a
minute of being onsite it became apparent that the footer pour was
imminent, so of course we had to stay!
still think I get a bigger kick out of this than the kids most of the
time, they just play around on rocks and dirt piles while I snap
pictures of the action, but what a fun process to watch! As you can
tell we stayed long enough to see them pour and agitate the concrete,
level it, float it smooth, and insert the rebar to connect to the
foundation. And it was all over in under thirty minutes!