A drop-in is typically a space where sanctuary seekers can visit, maybe once a week, which provides friendly faces, the opportunity to chat and meet people. Some drop-ins offer advice or signposting, others are purely social.
Examples
You may also be interested in:
Leicester City of Sanctuary
Leicester CoS run a long-standing and well attended drop-in
York Summer Drop-In
York CoS have been running a weekly drop-in York Theatre Royal