I am in a group of friends who meet to play dungeons and dragons. The person whose house we go to often cancels because their partner can't make it. So as we are all adults we don't meet up very often at all.
Last night was the final straw. They cancelled late, so I didn't get the email before rushing around after work to arrive on time, to find it cancelled.
So as our house has 3 people to play we have decided to run our own game and they can all come whenever they can make it. I am having trouble because I am generally blunt and know this isn't what is needed. I want to let them know I will no longer be coming, and invite then to join us whilst letting them know it will running if they aren't there. I'm worried this friend might feel offended that we're hosting the same game elsewhere. I want them to feel welcome to join us when they can, while asserting that the games will proceed with or without them.
How can I tactfully inform our friend that they will no longer host our game without offending them?
Update: It has been silence since I sent the email, not a single word from anybody, so that didn't go well at all.