Found 3 clubs within 25 miles of Lodi:

TOKAY RADIO CONTROL MODELERS
6.97 miles
MARK SHERRILL
108 SILVER ASPEN CT
GALT CA 95632
Phone: 209.745.7758

DELTA VALLEY MODELERS
11.52 miles
TIM CASSIDY
393 E MARKET ST
STOCKTON CA 95202
Phone: 209-462-3920

CENTRAL VALLEY FLYERS
22.15 miles
MICHAEL MATTHEWS
1152 THOMAS CT
RIPON CA 95366
Phone: 209-599-4770

Of course one or more of these may be the closed fields you mentioned.