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The ticketed event at the park also features nightglow displays when tethered balloons light their burners in time to music.

It detected a glowing rim in the planet’s upper atmosphere that scientists suspect could be “nightglow.”

As night fell, the officers, wearing nightglow vests and armed with searchlights, expanded the search up the hills along the numerous hiking trails.

There will also be a virtual "nightglow" when tethered balloons light their burners in time to music.

The virtual nightglow, organised in conjunction with BBC Radio Bristol, will take place at a private location on 8 August and will be available to watch online.