Our cluster is omitting the Eucharist from communion services and replacing it with prayers. Is this okay?
Yes. This is the correct liturgy outside of Sundays when there is no possibility for Mass.
A communion service can never substitute for Mass. If there is no Mass that can be reasonably attended by the faithful, then there is no Mass obligation. In the absence of Mass, the community is invited by the Church to pray the Liturgy of the Word or the Liturgy of the Hours. The Church sees Communion services during the week when there is no priest as an extraordinary exception rather than the norm:
Likewise, especially if Holy Communion is distributed during such celebrations, the diocesan bishop, to whose exclusive competence this matter pertains, must not easily grant permission for such celebrations to be held on weekdays, especially in places where it was possible or would be possible to have the celebration of Mass on the preceding or the following Sunday (Redemptionis Sacramentum 166).
Even on Sundays, the Code of Canon Law recommends a simple Liturgy of the Word rather than a Communion service:
If participation in the eucharistic celebration becomes impossible because of the absence of a sacred minister or for another grave cause, it is strongly recommended that the faithful take part in a liturgy of the word if such a liturgy is celebrated in a parish church or other sacred place according to the prescripts of the diocesan bishop or that they devote themselves to prayer for a suitable time alone, as a family, or, as the occasion permits, in groups of families. (can. 1248 §2).
Although the Church does foresee a Liturgy of the Word with Communion (i.e., a Communion service) as a possibility on a Sunday, the Church asks that such liturgies be rarely permitted on weekdays.