quote from the Lifeite News article, quoted above:
"Paragraph no. 137 specifically states:
“Catholic churches are consecrated or blessed buildings which have an important theological and liturgical significance for the Catholic community. There are therefore generally reserved for Catholic worship. However, if priests, ministers or communities not in full communion with the Catholic church do not have a place or the liturgical objects necessary for celebrating worthily their religious ceremonies, the diocesan bishop may allow them to the use of the church or a catholic building and also lend them what may be necessary for their services.”
Our RCIA class covered this possibility specifically.
In fact, our own parish has in the past borrowed a monstrance and an extra tabernacle from another Catholic church so that we could have an indoor procession from our sanctuary into our social hall during Lent, without at the same time depriving those who chose to remain behind within the sanctuary itself for contemplation of Our Lord's presence.
We have also had the assistance of two other Catholic Priests come and help out with Confession during Lent, so that all who wished to be confessed could do so within the Parish, rather than having to travel to another Catholic Parish.
I think that the idea of sharing with others what one has in a time of their need is a good one.
But I also recognize the difference between a need and a "want".
I think that this occasion listed above would not qualify as a need, but would qualify as a desired "want", since it is an occasion where the venue of preference was chosen for it's amenities, and not for it's ties to the Church that is requesting to rent it.