According to the Vatican website, here, the procedure for ad limina visits is as follows:
Art. 29 — These kinds of visits have a special importance in the life of the Church, marking as they do the summit of the relationship of the pastors of each particular Church with the Roman Pontiff. For he meets his brother bishops, and discusses with them matters concerning the good of the Churches and the bishops’ role as shepherds, and he confirms and supports them in faith and charity. This strengthens the bonds of hierarchical communion and openly manifests the catholicity of the Church and the unity of the episcopal college.
Art. 30 — The ad limina visits also concern the dicasteries of the Roman Curia. For through these visits a helpful dialogue between the bishops and the Apostolic See is increased and deepened, information is shared, advice and timely suggestions are brought forward for the greater good and progress of the Churches and for the observance of the common discipline of the Church.
Art. 31 — These visits are to be prepared very carefully and appropriately so that they proceed well and enjoy a successful outcome in their three principal stages — namely, the pilgrimage to the tombs of the Princes of the Apostles and their veneration, the meeting with the Supreme Pontiff, and the meetings at the dicasteries of the Roman Curia.
Art. 32 — For this purpose, the report on the state of the diocese should be sent to the Holy See six months before the time set for the visit. It is to be examined with all diligence by the competent dicasteries, and their remarks are to be shared with a special committee convened for this purpose so that a brief synthesis of these may be drawn up and be readily at hand in the meetings.
The organising body is the Congregation for Bishops, and that is, I imagine, the Dicastery to be addressed if we have points we would wish to be considered during the visit.
Its address is: Palazzo della Congregazioni, Piazza Pio XII, 10, 00193 Roma and its phone number is: 06.69.88.42.17 so we have no excuses.