Going to put this here for now regarding Guild Battle Summons (Hell mode in GW as an example) considering recent events.
1. DO NOT open the battle to pub or friends until we do all we can do for the battle. Gathering mats for the battle is a long process, and we only have a limited number of tries to make the best of them. That means use up your healing items including Guild Wars items.
2. DO NOT waste your Elixir/AP potions. That is up to you to use those, but I would rather you save them for when you really need them than on a Guild Battle, especially on a non-ranking one. I only say Guild Wars items because those disappear after the event, and you may as well use them if you got them.
3. CHECK with other members in battle before opening the battle to pub. That's just a courtesy because everyone wants to get their farm in.
For reference if you don't know what opens the battle to what:
As always, make sure to check the chat log to keep up with happenings in the guild and introduce yourselves to each other if you haven't already: