Your group rolls into a somewhat isolated village, there's a extravagant festival going on and the party's invited to join. As they reach the town's center, they find the thing this festival is out to celebrate. A twisted thing, recognizable as a dragon. Its scales twisted, discolored, and fused together in places, and its eyes are covered in blood-soaked cloth. It turns its head, adorned with flower wreathes, giving the party a brief greeting and turns its blind head back towards an ongoing dance.

The creature will actively attempt to steer the conversation away from talking about its conditions, only insisting that its inner eye can see just fine. If the party presses it on the issue: If they fail at persuading it into giving more information, the creature bares its teeth and hisses for the guard to remove the party (all the guards are drunk from celebrating, but do arrive).
If the party succeeds, the creature insists that it does not need their help and will politely ask the party to leave if they continue to push the matter.

If the party decides to partake in the festivities, the locals would invite them to their dancing and singing, and might even offer them a wreath to place upon the dragon. A druid or party member with a sufficient nature check might notice that the flowers in the wreath are very unusual, many of them being completely unknown and foreign.

From there it's up to you to have it be a one-off encounter, or expand on what's there if the party tries to get to the bottom of the dragon's ailments and why its being worshiped by the townspeople.