WGAutoRaid will automate process building up pre-Wintergrasp battle raids. Here is list supported features:

auto-invites from channels SAY, WHISPER, YELL, GUILD and all Global channels like Trade, General, Local Defense for Dalaran and Wintergrasp zone (accept 'inv' or 'invite' words no matter of letter case 'InV' is also acceptable)
auto-promote every raid member to raid assistant
auto-kick offline members from raid
auto-kick by level from raid (it will kick all members bellow certain level)
auto-announce send announce to defined chats cahnnels outgoing invites (use channels like SAY,YELL,GUILD and General). TRADE is not in list because I don't like see already spammed channel like TRADE being flood by my addon.
number of autoinvites given to single player is 3 then player will not get any invite, until next battle

Before auto-* features are activated (add-on is always active) next criteria must be met:

Need to be in group and be party leader at least for auto-kick and auto-promote. Create raid from start is not neccesarry because party will be converted into raid automaticaly. For auto-invite and auto-annouce is suificient to be raid assistant.
need to be in Dalaran or Wintergrasp zone and battle must be in progress or time to battle is less than defined time (it can be setup in options)

Auto-invites are limited when:

if low level player is kicked, then he will not be autoinvited anymore
if someone does leave raid and then he ask for reinvite he not be reinvited back when he does leave three times
if someone ask for invite in global/whisper/say/yell three times in row and not accept invite all other requests from same person will be ignored

Configuration can be fired via standard WoW system menu or using slash command /wgar.

When raid is full, it will be announced in same channels where annonce is enabled and and it will stops auto-invites, until is possible to invite people again.

If raid leader give raid assist then this add-on can handle auto-invites and can do auto-announce. Features like auto-kick and auto-promote are then disabled, because they need raid leadership to be able work.