Os Trinta & Um celebrate 31 years of activity with a special Halloween concert at Academia Recreativa de Linda-a-Velha. Doors open at 2:31 PM and the concerts start at 4:31 PM, with more bands announced for the program. 📅 Date: October 31, 2026 ⏰ Doors: 2:31 PM | Concerts: 4:31 PM 📍 Location: Academia Recreativa de Linda-a-Velha, Oeiras 💸 Price: not indicated in the source 🎟 Tickets: https://tinyurl.com/3h6cfdrn