Be sure to consider delays, especially if the birds are to be released after the reception. Birds can overnight in a tree if they need to but will be safest in their own loft. Birds with time to get home will fly better and be less likely to stop in a nearby tree. Males will fight, two females probably won't as much but won't coo. A pair will probably sit together prettily but may make cooing noises.
Real doves are good for display only and are probably quieter.
They are considerably smaller than Homers. Homers and doves are unlikely to bother flowers applied to the cage, so don't worry about the birds ruining the display as a parrot probably would. Cages can be hung from the ceiling, placed on stands or tables. Flowers and or gifts can cascade down around the table from the cage. Properly displayed bird will not have a smell or visible excrement.