wait list?

I am very interested in your kayak trip on the Columbia. I have my own advanced elements kayak that I use a lot here in Alaska and have been impressed by how well run the Road scholar trip was that I did in Costa Rica BC (beofre Covid) I've had my second shot and am ready to start planning more adventures. I am widowed and do not know someone else interested in this trip. I see that the single ones are all sold out for 2021. I have 2 questions - any possibility of sharing a room with someone else who also has had the vaccine? #2 - Do you have a wait list? I think I'm most interested in late Sept or mid October.