This design will be used on t-shirts, banners, posters and digital executions for the St. Patrick's Day event for this iconic Seattle restaurant and bar.  We are considering a grey t-shirts, OR possibly white or green t's?  Use colors of Irish green to lime green, white and orange (as an accent color). Be creative and have fun with it. Design something that you would want to wear! Look at their website. www.kellsirish.com + attached several files to work off of.  Shamrocks are fun. "Lucky You",  "Sing this with me..this is 40" (a play off of U2's 40) etc..  
I like the (white) t-shirt design below as a base. Maybe lose the circle boarder and have the green stripes extend out but fade out at end. Replace Celtic FC with 40. Use orange accent. Pike Place Market-SEA 1983-2023. I will try and provide feedback as renderings come in. Thanks and good luck! 
Could lead to ongoing work with them too...

MANDATORIES:
KELLS logo
40 years 
Pike Place Market-Seattle
colors provided above

KELLS - St Patrick's Day - Celebrating 40 year anniversary in Seattle