What is the best way to create a live event program with multiple locations?

Hello, I am still new to Marketo and I can't seem to figure out how I can easily create a live event program that will succesfully automate what I use to do manually.

Scenario:
We do the same live show in 6 different cities. In the past we used a static html website with a form that had the following fields:

1. First Name
2. Last Name
3. Agency Name
4. Email
5. Phone
6. Event

In the Event field, we had a list of the sites we would be visiting (e.g. May 27: 8 a.m. McAllen, TX)

Question 1: Can I build a drop down field for the Event that displays all six of our locations? I know that we do not have Event in our field management, so I would have to create this as a custom field, however, our CRM does not have this field, so how would I populate it manually? Or can I even do that?

The other part of our static html form from the past included an option for the same person to register on behalf of their fellow employees. We provided 4 first and last name fields accompanied by email fields to be field out.

Question 2: Is it possible to do this all in 1 form? Would we need to use 2 forms?

Question 3: Overall, will I have to build 6 different event programs, 1 for each location?

Thank you for your help!