It seems this position is made up of two parts:
- The purchase, storage, organization and dispensation of materials/equipment
- The cleanup following an event
To some extent the best way to define a name for this role depends upon the other roles involved and their responsibilities, as there may be a generic term which could be used provided it doesn't overlap with the responsibilities of others (Event Coordinator for example).
Without any other information though I would suggest some combination of:
First word: Materials, Equipment, Inventory
Second word: Supervisor, Manager, Specialist
If it's relevant, you could prefix any combination of the above with Event, if your role is strictly limited to events and there are other individuals in the same organization who work outside of the scope of events.
Personally, I'd probably go for (Event) Materials Manager. While this doesn't explicitly deal with the second responsibility of cleaning up after event, the more significant responsibility seems to be the procurement, storage and distribution of the equipment/materials, with the cleanup being secondary. Plus, I suspect that a reasonable proportion of the stuff you're cleaning up is those materials (ropes, balloons, glue etc.) anyway.
The single word you may be looking for is
lull - calm or send to sleep, typically with soothing sounds or movements
I'll sing a song to lull you to sleep.
as in lullaby.
Best Answer
As well as everything already mentioned, you can also hang wallpaper.