i'm going to a concert with three other people and only one of us has all the tickets in their account. Does this person need to send each of us our own ticket or can we enter the venue with just one person showing the tickets?

Just one person needs the ticket. When you pass the security screen, they scan your phone and the seat assignment tickets are printed then.

You are able to enter with just one person showing the tickets. As long as you're together. Even if one person is missing and comes later, the person with the tickets can come to find the missing person to scan their ticket for entrance. Unfortunately, there is no Will Call where you can leave a ticket for someone.

Yep all the above answers are correct. Just make sure you guys are all together. In fact tickets don't have the name of the people on it. So long as you have 3 tickets you can take any 3 people inside