We'd REALLY rather you mention it, ASAP.
We like to think we are good at what we do. We've worked with disabilities of all types, and they are rarely a barrier to entry into Archery with us. However, catering for you may have an affect on our staffing or on the quality of service we can deliver to the other people in attendance, and as such any undisclosed disability becoming apparent upon attendance could require a cancellation of your booking for the benefit of all.
We do not wish to deliver an inferior service to anyone, for any reason, so will always consider the benefits of the group as a whole.
It could be as simple as needing to bring equipment we wouldn't normally have available if, for instance, you have an existing Shoulder problem that means you couldn't stand the strain applied by our standard Bow, so please let us know anything that could be important.
If we think its advisable that the person with disabilities doesn't take part in the session, we will let you know.