Natural Wildlife (picture above) will be the lead group for a dance tonight in the Newcomb Hall Ballroom. The Richmond group is billed as one of Virginia's top bands, having backed up Chicago, Grand Funk, Jethro Tull and Three Dog Night during the past few months. The event is being sponsored by the Alderman Council and University Union. Time: 8 to 12. Admission: $2.50 couple, $1.50 single.