KL's annual oyster bliss is scheduled for this Saturday from 11am to 4pm. I went last year with a group of friends and had a blast. Definitely not cheap, but the food and drinks (i.e., Monterey Fish's oysters, Eccolo's sausages, Acme bread, desserts from Cafe Fanny and KL's wines by the glass) was really good!!!
A tip for those planning to attend, get there early (like around 10am) if you want a seat at a table, avoid the huge lines, and most importantly, find a parking spot. While you're waiting for them to begin selling the oyseters, you can purchase some pain epi to go with your oysters.
FYI, it's cash only.