"This is a heritage project that we have put into place. It will end up being a native bush oasis in a predominantly exotic forest," said Mr Hawkins.
Performing on the day is ukulele group Simply Strings, followed by Theory 89 playing music from the '60s, '70s and '80s. Closing the entertainment will be the Rotorua Symphonic Band with a selection of easy listening music.
The Lions will put on a sausage sizzle and there will be tea and coffee available for $1. All money raised is for grove maintenance.
"Please bring seats, blankets and a picnic, sit back and relax listening to a cross-section of music in the wonderful setting of the Dell," said Mr Hawkins.
What: Music Under the Trees
Where: TECT All Terrain Park
When: Sunday, 11am-3pm
Cost: Free