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Uniting The Dalles through Arts Culture and Inclusivity The Dalles Overgrounds mission is to bring original arts and culture to The Dalles Oregon and facilitate promote and encourage community diversity and inclusiveness through artistic platforms. Upcoming Events Support TDO The Dalles Overground is a 501c3 nonprofit. The Dalles Overgrounds mission is to bring original arts and culture to The Dalles Oregon and facilitate promote and encourage community diversity and inclusiveness through artistic platforms. Who are you.