Let's be honest, any major institution (government, churches, etc) and company will have made sure to protect themselves to the hilt with the army and/or mercenaries/militias, who for that night will have no bars placed on their bloodlust. So, attempting to do anything against them is a non-starter no matter how large a rioting mob you can get together, because they'll just break out the assault rifles, RPGs, chaingun-and-hellfire equipped helicopters, proximity mines etc and cut you all to bloody ribbons within a matter of seconds. Including the NRA nuts, if you're in a country where heavy weaponry is easily available to the general public.

The real losers in any such situation will be the little guys - small business and low rent private residences that happen to get in the way of the mob. See any real world city centre riot for an example, though in this case you're not quite as safe from your fellow mobsters as in a typical riot because you haven't got quite the usual same us-vs-the-man unity of purpose and are at risk of being attacked by any other random member of the crowd should you let your guard slip for a single second. Unless you're already a gangbanger you probably wouldn't survive being part of it.

Really, anyone on this forum is probably at a distinct disadvantage.

I'm in a rather secure location myself, as my apartment is the last one on the hall on the top floor, in a low rise building (thus no fire escapes, internal roof access, elevators or balconies - the only way in or out is the main stairwell) made of hard-to-burn materials. It's therefore extremely easy to defend (rig up some metal shutters for the windows and front door, perhaps work with neighbours to organise fitting them to every apartment in the small block for mutual protection, and then go full Tower Defence on the stairwell and the outdoor approach to it… South African anti-carjacker flammenwerfers, razor wire, high voltage electrification, smoke machines, flashbang style strobes and sirens, and cctv plus fire suppression systems of course… maybe some passive periscopes, battery powered lighting and systems actuated without electricity in case the power gets cut), and up an obscure side street just the right distance from the nearest main strips that it would likely be ignored both by those looking to smash the shit out of downtown and those who prefer to fuck up the suburbs or hunt isolated residences in the countryside.

Perhaps just hole up by myself hermit style with some strong coffee, home-made morningstar and a machete or short spear, in my kevlar-webbing and polystyrene joint protector motorbike gear (what's good for protecting you from falling off at 70+ mph is also fairly good as melee armour), including the helmet and gloves, and settle in for the tensest game of FNAF or SCPCB ever…

Or maybe allow a select few intimately trusted family and/or friends to huddle there with me, though there'd have to be some additional, agreed-on mutual protection measures to provide some assurance against any one of us going rogue (including myself of course, though we could probably trust the under-10s…), though I don't know how you'd easily do that in a ~2000sqft flat. Maybe each person or small mutually trustworthy group (parent(s) + child(ren) for example) could have a room each, with armour and strong, two-way mechanical-timer locks on each door and a pre-inspection to check for kill-traps.

Or just armour the fuck out of the flat and garage, lock the car away, take my compact 2-man tent and some makeshift weapons and perimeter defences, get on the bike and get the fuck out of town, using its greater offroad abilities to reach somewhere random and defendable to camp out that's several hour's on-foot travel from any population centre, and preferably any hard surfaced road. Start point is almost dead centre of a pretty major conurbation, but with a few hours head start before the clock starts, a 20-litre (or even jus t 1 or 2x 5-litre) jerrycan of fuel and some google maps research in the weeks leading up to the purge, there's plenty of suitable pieces of trackless wilderness that I'm familiar with and could reach with reasonable ease, especially with the aid of an easily handled offroad capable powered vehicle, with countless rocky outcrops that could keep a person hidden from any overlook or other distant observer whilst still giving them the ability to see anyone else approaching. Sure, the tyre tracks may be a giveaway, but following those, at night, either on foot or another bike would be quite a challenge. Especially if I took a random, repeatedly overlapping ride around the area first, maybe a day or two earlier to avoid making too much obvious noise.

(I've got no illusions about my own combative abilities, even if I had any desire to take advantage of the lack of rules - which, tbh, I don't, at least not in terms of any kind of reasonably soft target that wouldn't easily repel any attack - it's pretty obvious that trying to follow it through would be a rapid one-way ticket to An Hero-dom)