I’m preparing our WordPress site for PestEx London (ExCeL, 18-19 March) and need a single, lightweight pop-up that quietly promotes the event to our B2B visitors. Here’s what I’m after. A clean, minimalist layout that fits an industrial audience—neutral palette, plenty of whitespace, expo logo and a short headline; no animation, no busy effects. The pop-up should appear a few seconds after the page loads, carry a clear close icon, show only once per session via a simple cookie, and remain fully mobile-responsive. The call-to-action is a single button reading “Book Your Appointment” that routes straight to our existing Contact page. I also want an easy on/off switch in the back-end so I can disable the pop-up the moment the show ends. Please avoid heavyweight all-in-one plugins; a small custom script, a very light modal library, or similarly lean approach is preferred, provided it has zero noticeable impact on page speed scores. Deliverables • Fully implemented pop-up on our staging site and instructions for moving it to live • Brief documentation covering activation/deactivation and where the cookie lifespan can be adjusted • Any custom CSS/JS files neatly commented I’ll supply brand colours, logo files and access details once we start.