Define larger?
The Blackwater Company is a cross-faction guild. We technically were before it was a thing having both a Horde and Alliance side to the guild. We used a single discord and community to communicate until we could merge into one, keeping the old guild for OOC alts or alts collecting dust. 95% of our events are cross-faction friendly. The only ones not being are the respective recruiting fairs, as we do not try to ‘sneak in’ the opposite faction into capital cities. We are a capped guild, so inactive get removed after a certain period to keep our activity level up, we will never be huge, but we can be busy.
We also run a Tavern, The Rusty Nail, on Tuesday that has been cross-faction for years and host other events out of Discord community as well that are cross-faction.
All that to say, we are shipping/trading/merc group (pirates) and so we don’t work for everyone as a guild but we may for other kinds of events through the tavern.