Bring soft, comfortable clothes you can layer, and in colder weather add warm socks.
Pack a small notebook and pen for reflections afterward, an optional meaningful keepsake as an anchor, and personal hygiene basics like a toothbrush. An eye mask is often provided, but bring your own if you prefer.
If you do not want music over speakers, take your own headphones and playlist. Many venues supply bedding and towels, but I cannot verify this for your session, so check ahead. Aim for a calm, open mindset and keep your schedule clear that day.
For a simple preparation overview, see this guide on preparing for a psilocybin session. Have a grounded, comfortable session.