There's nothing that can be done at the church end. The church doesn't "push" the calendar. It's up to the receiver, in this case Google, to request the sync. If there's any settings in Google, I haven't found them.
Now, I'm not sure about iPad, but sometimes in Android you can turn off the sync for that one item and turn it back on and it will re-sync right then.
You also might want to look at having your iPad sync directly. From the other messages, you do have a choice of sync times there. Note that no device/calendar you have can request a sync more often then 9 minutes. This is a cumulative limit, not per-device.
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