When Should i invite player to my session?

Question is kinda straight forward but i'll be running my session soon but i don't know when i should invite the players.  Please help.

Well in advance so you can assign then Journal entries for their characters. 

Thanks

I'd suggest making a game splash screen map and leaving the player ribbon on there, that way you can safely work on prepping other pages without a player logging in to see it.

If you don't want to wait for them to log in to the campaign, you could create a half dozen character sheets ahead of time and set them to all players for control and editing.

I usually invite the players into the game itself so that I can assign them their sheets as soon as possible. I use the splash page and the talktomyself command while working on game material so the players don't see anything if they drop in. This let's me set up everything properly plus if a player drops in, I can chat with them briefly and make sure any audio/video usage works properly prior to the game itself.