Proposed Solution:

Item-Level Toggle: Within the item creation/edit screen, add a toggle or checkbox for "Requires Presence to Win" or "In-Person Pickup Only."

Bidder Confirmation Prompt: When a bidder attempts to place a bid on an item with this toggle enabled, a clear notification or pop-up appears stating: "Note: You must be present at the event to win this item. Do you wish to proceed?"

Visual Badge: Display a distinct visual badge (e.g., "In-Person Only") on the item's thumbnail card and main description page so it is obvious at a glance.