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Hi Andrew,
Thank you for posting, I am here to help. To make a contact group for 70 people try this steps.
Open new Outlook on the left pane click on the people icon below the calendar icon.
Select Home > New Contact Group.
In the Contact Group box, type the name for the group.
Select Contact Group > Add Members Add Members, and then select an option:
Select From Outlook Contacts.
Select From Address Book.
Select New E-mail Contact.
Add people from your address book or contacts list, and choose OK. To select multiple people, hold down the Ctrl key as you choose members.
Choose Save & Close.
For more details you can check this article:
Create a contact group in Outlook
I hope you find this information helpful. Please let us know if you have any further questions If the answer is helpful, please click "Accept Answer".
Best regards,
Jansher