This religious ritual featured in a dream predicts sad, but not griev- ous, news, unless the ser- vice was out of doors, in which case the omen is reversed and the news will be joyous.... The Complete Guide to Interpreting Your Dreams
To dream that you are taking part in the Holy Communion, warns you that you will resign your independent opinions to gain some frivolous desire.
If you dream that there is neither bread nor wine for the supper, you will find that you have suffered your ideas to be proselytized in vain, as you are no nearer your goal.
If you are refused the right of communion and feel worthy, there is hope for your obtaining some prominent position which has appeared extremely doubtful, as your opponents are popular and powerful.
If you feel unworthy, you will meet with much discomfort.
To dream that you are in a body of Baptists who are taking communion, denotes that you will find that your friends are growing uncongenial, and you will look to strangers for harmony. ... Ten Thousand Dream Interpretation
Providing a service in a dream, depending upon how one feels about the service, may indicate something the dreamer wishes to share, or an ability that needs to be expressed. If, however, one is in need of the service—such as automobile service at a gas station, then a stop or respite to replenish or renew oneself may be indicated.... Dream Symbols in The Dream Encyclopedia