Great — here are proven options in Dubai that have communal/shared lounges, social bars or co‑working hubs where guests naturally meet each other. I’ve grouped them by type (hostels for the most social scene, lifestyle/mid‑range hotels, and serviced/aparthotels that run regular social gatherings).

Hostels (best if your goal is to meet other travellers)

• The Journey Hostel (JBR / Dubai Marina) — rooftop/pool, in‑house bar and an explicit shared lounge + coworking area; lively, budget‑friendly spot for meeting guests. (booking.com)
• HomeStar Deluxe (JBR) — dorms and mixed rooms with communal lounge/kitchen areas; popular with backpackers who want social spaces near the beach.