When can I drop in to an event? Charlie July 06, 2018 01:35 Updated Follow You can drop-in to an event as long as it's a free event. We don't allow drop-in for paid events. Related articles How do reimbursements with Twic work? How do points work? How To Use My Twic Virtual Card Is the Twic card a debit or credit card? What is Instant Checkout? Comments 0 comments Please sign in to leave a comment.