I need to remove all sensors (sonoff motion and contact) from the house for a relocation. They will be placed in a bag for 2-3 weeks. Is there way i can turn then off/disable from my Hubitat, so that they stop triggering events? Probably that will save a bit of battery and will prevent my rules from triggering?
You can disable the device on Hubitat, but that only affects driver code that runs (which will also prevent your apps from running based on those events--there won't be any). It won't help with the device itself, which will continue to communicate with the hub as normal. If you're concerned about a couple weeks, I might suggest removing the batteries.
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If they are Zigbee, I think just pulling the battery should do it. ZWave, not so much, as it would affect your mesh.
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I am trying to be lazy and avoid pulling all battery out and then back again 
Sometimes a little work save a bunch of headaches. 
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At this point, if I turn off the Hub itself, is there any harm? I mean, I am moving to new house so just removing all devices and will begin putting them back in new house.
It seems to me that you will need to start from scratch. I doubt any current devices are labeled correctly, and the rules would almost certainly be different. Unless you are moving into an identical new home.
You will probably want to remove the batteries if the sensors are taken out of range of their parent routers; otherwise they will be continue to be depleted-- when a Zigbee sleepy device loses contact with its parent it no longer sleeps. Instead it initiates an 'orphan scan' and will continue looking for a new parent to rejoin the network.
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Not sure how the new location will maintain you old location mesh(s). But once the hub is off I suspect the loss in battery life (2-3 weeks) is minimal its not worth worrying about.
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In the new location, I plan to first connect only my repeaters for a day or two, before I start putting my sensors/devices in place.
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The Zigbee orphan scan process consumes a lot of power vs. the normal cyclic sleep/check-in when joined to a router (depends on the device but could be 20-30mA with radio on during scan vs. less than 1uA when asleep). A fresh 800mAh CR2 battery would probably last about a week if the device is constantly scanning.
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It seems the best approach is to remove the battery as you uninstall the sensors and place them in the bag.
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