Anyone is allowed. No tickets needed for anything on the church except guided tour. When mass is running, center aisle is reserved just for mass attendance, but tourists can look and walk around. Mass duration is short, 30 min.
You don't need any ticket to get in. Everybody can go.
Anyone can go to the mass but you cannot have communion. I don't know if you need a ticket for the Mass. I don't think so. Be there 15-20 minutes before Mass starts.
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