Joe4d does have a good point. A large group ride is not the best time for a first ride and on unfamiliar horses. It's honorable that you want to participate in it but your safety is utmost important.
When passing, it can be done politely or inconsiderately. Flying by at a gallop is not considerate. One should pass at a slightly faster pace but giving ample room between the horses. However that doesn't always happen. When riding in a group, you should ride at the level of the least experienced rider. In large groups there are those that aren't considerate and don't care.
Organized rides should have rules set down before the ride that everyone is suppose to follow. During the ride, it's hard to enforce those rules and rely on everyone to follow without being policed.
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