New method to get in

You can now use a Partners Carriage and take anyone to Tir Na Nog from yours or your friends homestead . The same is applied for anywhere in the game, as far as I know

I thought you can't summon carriages in homestead?

Apparently you can summon carriages and brooms in homesteads but you can't enter homestead while one is out, gotta desummon, enter, re-summon.

I hear the Broom isn't a valid method for this?

Why not? You don't both need to be on the mount, do you?

The owner has to be on the mount and the mount can't hold two.