When using the import tool for existing trips with participants already on them, they are automatically sent an email like the following:

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Rachel,
You have been registered for the Spain/Morocco 2020 Short-Term Mission Trip mission trip by Jeff. First things first. Let's activate your account so you can get started. Click on the link below to choose a password for your account. Afterward you will be redirected to your dashboard to manage the requirements for the mission trip

[ACTIVATION HYPERLINK]

Please note that you can always get to your mission dashboard by following the link below after you have activated your account.

[LOGIN HYPERLINK]

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I'd like to suggest that this email does not go out to the participants until the trip has left setup mode and is live.