More than 23,000 people are expected to attend the heavy metal music festival at Discovery Park this weekend, according to the Sacramento Police Department.

If you plan to be near Garden Highway at Interstate 5 -- The east and westbound lanes will be closed to traffic except for concert goers from 9 a.m. to midnight on Saturday and Sunday.

Parking is available at the Sleep Train Arena and shuttle busses will be going to and from the concerts each day. Shuttle tickets are $30 for the weekend or $15 a day.

Several big named bands like Slayer, Tool and Avenge Sevenfold will be playing at the festival.

For a full look at the lineup of 30 bands visit the Aftershock website.