As a guild we have open our raid planner to external players that cant but they want to raid on T5/T6, ofc some gear restrictions are in place cause after all you cant come with RF attitude in T5/T6 but our basically requirement is a mentality to learn and play good your class and adapt on each moment.
Link for raid planner :

Of course we are still open to any new/old people coming back in the game and looking for a guild to raid or have some friendly environment to play and interact.