If I were a priest, I would only celebrate outdoor Masses in the following circumstances:
1.) A group was on a camping trip or somthing that was too far from a church or house to have a Mass indoors.
2.) A crowd larger than nearby facilities could hold was expected.
If one or both of those circumstances happened, I would have the outdoor Mass, but I would insist on the following:
1.) The faithful may not receive from the chalice. (I wouldnât give this option anyway- not even in a parish church- priests are not required to)
2.) The faithful MUST receive on the tongue (according to canon law this can be insisted upon if there is danger of profanation of the Sacrament).
3.) The faithful must still kneel at the appropriate times.
But your profile does not indicate you are Catholic. How could you even be a priest?

Or is it just opinion? Just curious. Your rules seem rather stringent for somebody who is N/A, so they intrigue me.
SEGUE
As I said, the local diocese has given dispensations for âscoutâ Mass out in the open, as both scout camps are not located in places where a bunch of kids could be herded onto busses, lugged off to a parish (none nearby either camp without a long drive), and lugged back without taking up the entire day. It is set in a area where there are benches and a pavilion, sort of like a picnic place, but not used for eating (Girl Scouts: Meeting area. Boy Scouts: Designated chapel area). A crucifix is available. A portable altar is available, not a card table or ironing board

.
At the Girl Scoutsâ, Mass takes place BEFORE the Protestant service. The bishop comes out to at least one of the Masses to celebrate it himself, and to inspect things. The girls often come as individuals, have a set bedtime Saturday night throughout the camp, and are divided into units by age.
The Boy Scouts celebrate Mass AFTER the Protestant service, but the Boy Scouts often go as a troop and the Catholic ones bring their own chaplain, who celebrates for anybody who happens to be there who is Catholic. The boys
donât have a set bedtime, stay up often into the wee hours, and are dependent upon their own troop for meals, etc. They want the boys just as they wake up and clean up, so nobody breaks their Communion fast. The bishop comes out to several of these, as the Boy Scouts have a different geographical boundaries. The bishop also thinks itâs a good way to discuss vocations.
The priest offers the Precious Blood to the adults (anybody over 16) who happen to be in the first wave of communicants, as they donât consecrate more than one chalice will hold. Thereâs no need to deputize EMHC, as there are only about 100 or so communicants a week. The girls bring their sit-upons, and those who choose to kneel do so. The boys are formed in ranks. They all receive in the hand or the tongue, as they choose and is permitted in the US.
The girls, for the most part, behave. They occasionally have to be shushed, and have to be reminded before Mass that their Protestant friends theyâve brought along may not receive (girls always seem to come in pairs). The boys who do not behave or try to start trouble are dragged back to the camp site and baby-sat by an adult or somebody like an Eagle or OA.