Anybody with a router is likely setting up, or already has set up intelligence gathering tools.
As demonstrated in CHAZ, some clever folks set up free WIFI points around the area and snared quite a few ANTIFA/BLM/JBGC. They created a map of who was communicating with who.
OPSEC dictates probably the best strategy is to leave your phone at home, but nothing is perfect.
I would also take the time to encrypt your phone contents and set up an actual password, not face unlock or fingerprint. If you get picked up by LEO, remember your right to not self incriminate, enumerated in the Fifth Amendment.
Food and water would be essential items to bring with you, bring plenty for yourself and some to share if you want. A small first aid kit wouldn't be a horrible idea either.
Stay together, make plans and backup plans and rally points if you get separated from your group.
God bless you and be safe. I'll meet you all there.
EDIT: the comments here have excellent suggestions, I only watched a couple DEFCON videos a few years ago about WIFI activity being intercepted for intelligence gathering purposes. Heed the advice of people more knowledgeable than myself.
Usually, I'd just say "avoid crowds," but we need a show of force. So some thoughts...
Either leave you personal cell phone or block the signals. Don't use it during the 6th if you can avoid it.
Use a cash-paid burner as an emergency phone and a camera. I like the concept of the handheld cam, but you'll stick out in the crowd.
For local comms during the event, look at using a personal radio with an earworm so you can hear in one ear the whole time. Pedes should probably be meeting in advance with groups parked near one another so they can stay together near the end and avoid PantiFA problems. The group is likely to be separated during the chaos, so localized comms will be important.
If you're not a HAM, consider using a MURS radio instead of the cheaper, more plentiful GMRS radios that you get at Wally-World. There will be fewer people on the same frequencies.
Keep comms short and sweet as there will be a lot of traffic, and it will be possible for everyone out there to intercept it. Meet up in advance, and/or come up with some comms strategies here on TDW in advance.
Carry some food, water, and basic supplies. Chaos may reign. Do not count on local hotels and/or restaurants.
Be ready to move at a moment's notice...