[P]=Permanent event/charity! It will always be around, even if it gets changed up a bit from update to update.
[E]=Event-centric, which means the thread is related to a specific holiday or event, and will eventually close.
[SP]=Semi-Permanent, reserved for when we are unsure of wether to keep thread/charity/event going!
No one else HAS to do this, I am just using it to clarify future threads. Feel free to still post casual little giveaways and charities amongst yourselves, still, too.