If your club is a Registered Club then you are entitled to sell alochol to members and invited guests. This is what happens with golf clubs, GAA clubs etc that have a bar.
Now I am open to correction but I think for any other premise to sell alcohol on an occasional basis the application must be made by the holder of a licenc eto sell alcohol e.g a publican.
In the country on occasions of point to points etc the local publican can get a licence from the District Court to sell alcohol at a designated location, often a marquee, to cater for people attending the event.
Not to give a short answer but you will need a solicitors advice on this but I think what I have said is going in the right direction