PeopleVine supports a ton of different ticketing options to accommodate your event. Specifically, you can setup a general admission event (whether you want to charge or not) and allow people to select multiple "tickets".
To set this up, follow these steps:
Login to the Control Panel
Go to Sell > Events > New Event
When creating the new event, locate the "How do you want to handle event registration?" section and select General Admission event.
4. You will now see options to set a limit of tickets available, price per ticket and maximum # of tickets a person can purchase.
5. You can set the price per ticket to 0 if you don't want to charge. But enable people to invite others by increasing the maximum # of tickets a person can purchase.
If you would like to capture the guest's name, you can include a form and attach it to the event.