How often are we meant to do them?

i have no idea if its 'right' , but i do a fire drill once a month, and vary it, so that every 3 months, every child has had a practice at least once.

i do a BIG risk assesment for EVERYTHING at the start of each term, and then a quick RA for car/house/outside/equipment/toys each month - doing 1 a week. i have a calendar with everything marked down on it ( plus checking smoke alarms work each month too )

i have a folder of RA that cover assorted parks, outings, library, toddler groups etc etc -places that i visit, that i update periodically-when i see/know something that means i need update the policy, or if we haven't be somewhere for a while.

plus a few varied RA for things like snow, hot weather, christmas etc!

have fun!