If you are logged in you can see more information by simply clicking on the item that interests you. This will take you to the individual event page where you can contact the Event Organiser by clicking on the 'Email Organisers' icon at the top of the page. When you've finished composing your email, don't forget to press the button at the bottom of the page before you leave!
Don't forget that you can also attend events organised by the Third Age Trust. They are listed on their website here