A solstice is a turning point; some people consider a lunar eclipse to be a good time for working on the emotions, for going deep into your own psyche to your inner and hidden aspects; the full moon is believed by some to be a good time for any spells, especially protection and divination, fertility, creativity, healing, knowledge, romance, anything positive that you need to increase; the full moon in Gemini would affect issues such as communication, writing, wit, study, healing and travel.
Based on the above information I personally feel that tonight would probably be a good time for opening the third eye, although I would do this as part of a whole chakra balancing and opening exercise.
The only experience I have had with opening the 3rd eye is as part of chakra opening and balancing exercises done before meditation, which is followed by closing of the chakras which should be done at the end of the meditation. Examples of this type of chakra opening can be found on this page of the Spheres Of Light website. You might like to try the very first meditation in the list, called "The Healing Room" to experience this.
I hope something here is helpful to you.
Suggested ebooks:Shanddaramon - Self Initiation For The Solitary Witch
Order Of The Golden Dawn - Meditation With The Archangel Auriel
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