Hi @CarrollSchreibman,
You cannot add attachments to a Constant Contact email, but if your calendar program does not offer a shareable link, you could upload an .ics file to a file sharing platform of your choice and generate a URL you could use in hyperlinked text that way. Alternatively, if your plan includes RSVP blocks and it works with your agenda, you could put a block in your email that allows them to RSVP from the email, and they will see a Thank You page that will have an "Add to calendar" option in it.
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