While the Halo Championship Series hasn't officially announced the location of its next LAN, it appears that the HCS is returning to a familiar location for Halo fans.
The Orange County Convention Center's website has "Microsoft Global Event #2" listed on their events calendar on the same exact dates that HCS Orlando 2022 is scheduled for.

Given that Halo has used the venue in the past, most recently with the Halo: Outpost Discovery in 2019 and the HaloWC Orlando Open in 2018 it's safe to assume that this will be the location of the next $250,000 Major Halo Infinite tournament.

Event: HCS Major Orlando 2022 (Split 2 Finals)
Dates: September 23rd - September 25th
Location: Orange County Convention Center
Airport: Orlando International Airport (MCO)
Related: Where can I watch Halo esports?