"Riverdale" Season 1 will officially be a part of WonderCon 2017. Not only that, the official plot description and promo clip for episode 9 "Chapter Nine: Le Grande Illusion" is provided here.

According to CBR, the schedule of events for Warner Bros. Television programming at WonderCon Anaheim has been unveiled. The events include two "Riverdale" events, a special video presentation and Q&A and an exclusive screening of a brand-new episode.

The event will take place on March 31-April 1, 2017 at Anaheim, California.

As for the official plot synopsis of episode 9, Spoilers Guide notes, "Ulterior moves. Archie (KJ Apa) reluctantly agrees to escort Cheryl (Madelaine Petsch) to her family's official start of maple syrup tapping because he gets an offer that could help his future. Archie starts to become skeptical of the real reason the Blossoms are so eager to help him, however, he gets some helpful information for Betty (Lili Reinhart) about her sister.

Veronica (Camila Mendes) is trying to be nice and unbeknownst to her, befriends a classmate that her father's illegal doings have hurt. Hermione (Marisol Nichols) is conflicted about telling Fred (Luke Perry) the truth. Meanwhile, Alice (Madchen Amick) is ready to get revenge on the Blossoms once and for all with the help of her two daughters."

Meanwhile, Flickering Myth shared a number of photos for "Riverdale" Season 1 Episode 9 titled "La Grande Illusion." In the said episode, Archie will reluctantly agree to be Cheryl's (Madelaine Petsch) escort to her family's official start of maple syrup tapping. The former will only agree because he will receive an offer that doing so will help him in the future. Although Archie will be skeptical about the Blossoms eagerness to help him he will get helpful information for Betty.

"Riverdale" Season 1 episode 9 is titled as "Chapter Nine: La Grande Illusion". The upcoming episode is scheduled to premiere on Thursday, April 6, 2017, at 9:00 p.m. EST first and exclusive on The CW.