. >> reporter: hal stevens is a t money he makes monthly events. >> it's been tough. i'm barely keeping my head above water as it is. every little bit counts. this is a real big bite. it took a big bite out of my account. >> reporter: for other vendors like this jewelry maker, the reboot of first fridays is most welcome. was it tough taking a month off. >> i think it was. this is one of my favorite places to do work. i'm happy it's back. >> reporter: now, i'm in the beer garden. actually, you can see not many people here yet. drinking is okay, but only inside a space like this. they are going to more tightly enforce their rules about not drinking outside of this area. you can see there's a lot more security here and the big concern is what people will do after the event ends. so there are a lot of plans about how people leave and where they go. they're trying to spread a lot of information about safe places to go after this event ends at 9:00. in oakland, laura anthony, abc 7 news. >> thank you. for more information on what's taking place at tonight's first friday eve

. >> reporter: hal stevens is a hot dog vendor who relies heavily on the money he makes at the events. >> it has been tough because i'm barely keeping my head above water as it is and every little bit counts, and this is a real big bite. it took a big bite out of my account. >> reporter: for the tens of thousands who enjoy first fridays, the hope is that it stays safe, not just during the event but also in the hours after. >> reporter: do you feel like you are safe here with your kid? >> absolutely. absolutely. there's many things to see and entertainment and food. it is just wonderful to be here. >> reporter: now, this event ends officially at 9:00. it is what happens after that that most concerns organizers and, frankly, city officials and the oakland police department. they have done their best here this time to try to provide good information to folks about where they should go after this event, to venues that are safe to try to ensure there's no trouble oof the party. in oakland, laura anthony, "abc 7 news." >> thank you, laura. >>> "abc 7 news" has obtained police body cam foota

steven avery. he and his teenage nephew were convicted in the brutal murder of photograph ee eer teresa hal. two sides, one truth. who will you believe? >>> the mystery of what happened here in rural wisconsin has captivated the country. >> we find the defendant steven avery guilty. >> reporter: in 2013, the netflix series "making a murderer," convicted of murder. it's a case "dateline" has been following for a decade. as the lawyers fight for them to be free from prison, we pose the questions that everyone has been asking of the people that put steven avery behind bars. why would steven avery do this? >> that's a good question. >> reporter: we asked ken katz, who wrote a book about this. >> he started planning this event the first day he went to prison. >> reporter: and we talked with a lead investigator of the case, who has come under fire for this silent interrogation. why are you sitting here today? >> i realized that someone needed to speak out to tell the truth of what happened. >> reporter: so, what did happen here? the story begins with the woman at the heart of this case, a 25-year-o