The *NSYNC boys are attempting some 11th-hour press before the ‘Trolls’ movie hits theaters — and one way they’ll be plugging the product is with a group powwow in front of cameras.

Sources with direct knowledge tell TMZ … Justin Timberlake and the other 4 boy band members are planning to attend a premiere, of sorts, later this week in L.A. ahead of the animated film’s release … which drops Friday.

We know this coming-together is happening Wednesday somewhere in Hollywood — but the exact details are being kept under wraps for now. Our sources do say, however, that all of the fellas started making last-minute travel arrangements for this as late as Thursday.

It probably goes without saying … this is happening at the behest of the studio, Universal, which we’re told wants to try and get *NSYNC out in front of reporters and the public any way they can to promote the film … they obviously know how popular they are as a unit.

Now that the SAG-AFTRA strike is over, just about every major studio is doing this — namely, getting their big stars together and attempting to get a little momentum amid some mediocre box office returns lately. Brie Larson tried it this past week … to no avail.

We’re told if the strike would’ve ended a month or so ago … Universal would’ve planned a massive premiere with all 5 members, but instead — they’re whipping up this somewhat smaller event in hopes that it can drum up some buzz for ‘Trolls Band Together.’

None of the *NSYNC guys have been able to talk about/plug the flick — obviously JT voice acts in it, but so does Lance Bass, Joey Fatone, JC Chasez and Chris Kirkpatrick. They all have credits on IMDb … so it seems their work on this goes beyond that nifty new song.

Now, if you think this public outing as a team signals of a larger reunion tour to come — you’re unfortunately wrong … sources tell us that ain’t happening in the near future. Justin’s working on a new album/tour, and scheduling remains an issue. Never say never, though.