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, alone:
Peter, Apostle

Principal Service
Ezekiel 3.22-27
Psalm 125
Acts 12.1-11
Matthew 16.13-19

(or)
Acts 12.1-11
Psalm 125
1 Peter 2.19-25
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,
who inspired your apostle Saint Peter
to confess Jesus as Christ and Son of the living God:
build up your Church upon this rock,
that in unity and peace it may proclaim one truth
and follow one Lord, your Son our Saviour Christ,
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.

BCP Collect

O Almighty God, who by thy Son Jesus Christ didst give to thy Apostle Saint Peter many excellent gifts, and commandedst him earnestly to feed thy flock; Make, we beseech thee, all Bishops and Pastors diligently to preach thy holy Word, and the people obediently to follow the same, that they may receive the crown of everlasting glory; through Jesus Christ our Lord.