It’s time once again for a LA Halloween tradition—the West Hollywood Halloween Carnaval returns tonight along with the legitimately scary street closures the annual event always brings. The free event takes place from 6 to 11 p.m. on Santa Monica Boulevard, from Doheny Drive to La Cienega Boulevard.

With Halloween falling on a weekday, street closures are bound to impact some work commutes. Here are the streets you’re going to want to avoid today:

Santa Monica Boulevard will be shut down entirely from Doheny Drive all the way east to Croft Avenue. The closure starts noon today and lasts until 6 a.m. Tuesday.

La Cienega Boulevard from Melrose Avenue to Holloway Drive will be closed to traffic starting 4 p.m. today. The closure ends Tuesday at 6 a.m.

San Vincente Boulevard will be shut down between Cynthia Street and Melrose Avenue. This closure will last the longest; it began at midnight and will last until 7 a.m. Tuesday.

In addition to those three big road closures, Robertson Boulevard, Almont Drive, and La Peer Drive will all be shut down from Santa Monica Boulevard to Melrose for Carnaval. Those three street closures will last from noon today to 6 a.m. Tuesday. Alleyways between Santa Monica Boulevard and Melrose shut down to traffic at midnight and last until early Tuesday morning.

West Hollywood is urging people to take alternate modes of transportation to Carnaval. The city has three free transit services available to help shuttle people to and from the event:

CityLineX runs from 5 p.m. to 8 p.m. from Hollywood and Highland to Santa Monica Boulevard and Sweetzer Avenue.

Hollywood Link runs from 8 p.m. to 1 a.m., offering service from Hollywood and Highland to the corner of Santa Monica and La Brea.

The PickUp will run from 8 p.m. to 11 p.m. along Santa Monica Boulevard between Sweetzer Avenue and La Brea, with a detour via Melrose Avenue to the stop on Kings Road and Santa Monica Boulevard. From 11 p.m. to 3 a.m., The PickUp will only run eastbound to La Brea from the Kings Road stop.

If you want to join in on the festivities, wear a costume and plan to party after the carnaval ends at one of the local bars. A full list is here.