Invitations question

I think you're fine with how the invitations are. People should be adults and figure out they need to get hotels reserved by October 11th.

I think if you don't receive RSVPs back by the October 1 deadline you can reach out and ask people if they plan on attending, and kindly remind them of the date.

We also sent separate texts/ messages to people out of town to remind them of the date.

I think your invitations look good! I think if you want to include the Oct 11 date for accommodations, I would put that at the top of that particular page on your website. All of our rooms need to be booked by a certain date in September in order for our guests to receive the group rate. As other PPs have pointed out, you could also send a reminder text/email to everybody who RSVPd to make sure they book their rooms by the group rate date.