According to the website for Bloom in the Park:
Bloom, Ireland’s largest gardening, food and family event, returns to the Phoenix Park Dublin this June bank holiday weekend for 5 days (Thursday 3rd – Monday 7th June). This year’s event will include over 20 spectacular showgardens, 50 floral displays and a large scale artisan farmers market.
Well there you have it. My interest in gardening is at best aspirational, but if the weather is nice enough then this could be fun. Might be a little pricey for the casual observer though... €15+ is not much if you'll enjoy a day at the event but a lot if you'd just like to take a quick stroll through the show.