Well yes and no. Yes creators with support open don’t need to have it unlocked during the event.
For your second question, mostly I believe it’s about making up fun activities people can participate in for an amount of ink or simply just to attract more readers who may donate some ink in light of the event.
For example, if a certain amount of ink is collectively donated to you by your fans, then you may do a Q and A, or you can give away merch to those who donate the most or simply just donate a certain amount of ink. The list goes on on how many activities you can plan, just choose what’s best for you
@wolflu66 hope this helps a bit