Maybe i'm old school in thinking this....

[5 Little Monkeys]

Babydom, our approach to our days sound very similar!! I felt like I could have written your exact post ....parents reactions, questions, cell etc lol

I started off giving a day or twos notice about field trips and than it became the morning of and now it's sometimes shooting a text to the parent saying, "we decided to do xx. If need me, text or call" I also tell them if we will be at a playtime for pickup. They love this !! I have a couple that said don't worry about texting, we trust you. If we need early pick up we'll find you!