I did a quick Google of "Canada Model Release Law," and found this info:
Why does it matter if the model is a minor?
If the model is a minor, he or she will need parental permission to
approve of the use of his or her image, likeness, or sound.
How do you define a “minor”?
Within the context of the Model and Entertainment Release, a minor ...
You are the parent, you are the photographer. Unless you plan to sue yourself for using an image then no. Flippant answer aside i would think that any publication or contest would require a model release form.
It depends on the nature of your contract when you hire the photographer.
Some photographers used to charge a low fee for shooting the event and make their money selling prints and digital rights to the images. This is common particularly in events where there are a lot of people who might like images. This used to be very common in weddings.
Your question is tagged w/ Canada, and the law in the common law provinces are the same as in the USA... a release form is only required if the image will be used commercially; and the release is required by the one using/publishing the image commercially, not necessarily the photographer (but the photographer is typically the one who obtains it).
The meteor shower is the annual Perseid Meteor Shower each year at about this same time.
Cellphones aren't ideal. While I cannot rule out the possibility of capture a meteor using a phone, it is unlikely to capture very many. This has to do with the unpredictable nature of the meteors and the techniques used to capture them (basically a form of lucky-...