Memberships › Marshalltown Concert Add On - Family Image 1 of 1 Marshalltown Concert Add On - Family $20.00 One-time add-on fee for a family membership to attend Marshalltown concerts in the ‘25-’26 concert season. Add To Cart Added! One-time add-on fee for a family membership to attend Marshalltown concerts in the ‘25-’26 concert season. You Might Also Like Marshalltown Concerts Add On - Single $10.00