Hello, i was trying to do the starlight event quest for the tidal talisman and ran into an issue. i went through and got the first couple cards and as i got the +1 items i equipped them and conitnued... And then i got the trousers, except i didnt (I had 2 slots, but proceeded to throw away 4 more items to be same for the future). it didnt let me trade with that npc again so i went on to the next npc, it DID give me trousers and actually put them in my inventory. However, now i have no more NPCs to trade to in bastok, and am missing the +1 hat. What should i do? Is there any way to fix this? I will provide the screenshot showed me getting the trousers twice.

You can continue on to NPCs in other cities in order to continue. Unfortunately you've exhausted the NPCs available in Bastok so go to Jeuno or the other 2 to get the rest.