I feel like I've seen cases where the verb "held" is used for a future event, as in
I will attend the World English Conference held on January 10-15, 2017.
And I found the same sentence in an ESL textbook recently. However, I can't figure out what that "held" is doing; it seems to me that the grammar should more accurately be "will be held" (future passive), but I also feel like I've seen this pattern before. Is this an alternative use of "held", or is it more likely just an error in the book (and in other places)?