29 June may be observed as the Festival of Peter and Paul, or as the Festival of Peter, alone.
If 29 June is observed as the Festival of Peter and Paul:
Peter and Paul, Apostles

Principal Service
Zechariah 4.1-6a,10b-14
Psalm 125
Acts 12.1-11
Matthew 16.13-19

(or)
Acts 12.1-11
Psalm 125
2 Timothy 4.6-8,17,18
Matthew 16.13-19

Third Service
Isaiah 49.1-6
Acts 11.1-18
Morning Psalms
Psalms 71, 113

Second Service
Ezekiel 34.11-16
John 21.15-22
Evening Psalms
Psalms 124, 138

Collect

Almighty God,
whose blessed apostles Peter and Paul
glorified you in their death as in their life:
grant that your Church,
inspired by their teaching and example,
and made one by your Spirit,
may ever stand firm upon the one foundation,
Jesus Christ your Son our Lord,
who is alive and reigns with you,
in the unity of the Holy Spirit,
one God, now and for ever.

Post Communion

Almighty God,
who on the day of Pentecost
sent your Holy Spirit to the apostles
with the wind from heaven and in tongues of flame,
filling them with joy and boldness to preach the gospel:
by the power of the same Spirit
strengthen us to witness to your truth
and to draw everyone to the fire of your love;
through Jesus Christ our Lord.

(or)

Lord God, the source of truth and love,
keep us faithful to the apostles’ teaching and fellowship,
united in prayer and the breaking of bread,
and one in joy and simplicity of heart,
in Jesus Christ our Lord.