DETROIT, MI -- Get ready, science fiction fans.

The North American Science Fiction Convention is in Detroit this weekend and will be held through Sunday at the Renaissance Center Marriott downtown.

This event, billed as "Detcon1," is expected to have nearly 400 unique panels, workshops, demos, talks and readings over four days.

Registration ranges from free for children up to 4 years of ages to $75 for an adult weekend pass. Online registration closed Friday.

Check out a preview video in the YouTube player below.

The convention's website says he's "one of the world’s most honored, diverse and popular writers." '

This event has appeared to be a major success so far. Record number appear to checking out whats offered.

A tweet from the official Detcon1 Twitter page:

Here's a look at some photos and tweets from this weekend's event:

New York Times bestselling author Steven Barnes is the convention's "author guest of honor."

He's written comic books, animation, newspaper stories, magazine articles, television scripts and three million words of fiction published in seven languages.

Barnes has written for "Twilight Zone" and "Andromeda and The Wizard," and wrote the Emmy-winning “A Stitch In Time” episode of "The Outer Limits."

He is an avid martial artist, and a certified yoga instructor and hypnotist who lives in Los Angeles.

Barnes received the 2003 Endeavor Award for the novel Lion's Blood and the 2009 NAACP Image Award for In the Night of the Heat, co-authored with Blair Underwood and Tananarive Due.

John Picacio is the convention's "artist of honor."

His cover artwork was used for franchises such as "Star Trek" and the "X-MEN," and he was the artist for the 2012 George R. R. Martin / A Song of Ice and Fire Calendar.

For a complete schedule of appearances and events, check out the convention's website.