Well with how things are right now. You can enter right away. You can have it be that your late for some reason since the others are there already. After all we are all still at the base for a while longer.
@Shadow Dragon it's about a group of people trying to rebuild a long lost order of assassin's. @kalinsovrin's character is basically the guild master. Sent out secret invitations to those that they thought were worthy of the title assassin