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https://www.psychologytoday.com/blog/emotional-freedom/201007/the-health-benefits-tears

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Laughter's the best medicine? Looks like it!

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Laughter's the best medicine? Looks like it!

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http://ca.hellomagazine.com/healthandbeauty/health-and-fitness/201011044438/laughter/health/benefits/

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When David went to bring up the Aron Kodesh from the house of Oved Edom HaGitti to "David, he celebrated and danced with all his might- וְדָוִ֛ד מְכַרְכֵּ֥ר בְּכָל־עֹ֖ז לִפְנֵ֣י יְהֹוָ֑ה

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DANCING as an EXPRESSION of JOY in TANACH:

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DANCING as an EXPRESSION of JOY in TANACH:

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After the splitting of the Yam Suf, Miriam brought out musical instruments and led the women in song and dance to thank God for saving their lives: וַתִּקַּח֩ מִרְיָ֨ם הַנְּבִיאָ֜ה אֲח֧וֹת אַֽהֲרֹ֛ן אֶת־הַתֹּ֖ף בְּיָדָ֑הּ וַתֵּצֶ֤אןָ כָל־הַנָּשִׁים֙ אַֽחֲרֶ֔יהָ בְּתֻפִּ֖ים וּבִמְחֹלֹֽת

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When she hears the angels say that she will have a son, Sarah laughs, commenting on her old age and the unlikelihood of such an idea.
This is clearly not a happy laugh for Sarah- unlike Rashi which describes "a time to laugh" as a time of intense national joy, Sarah's laugh here is during a time of deep emotional pain and sorrow.
Luckily for the Jewish people though, Sarah does have a child whom she names "Yitzchak", which comes from the shoresh of "to laugh"

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"Laughter" is mentioned 50 times throughout Tanach (ah, so that's why Jews make such good comedians @Jerry Seinfeld @Woody Allen @Mel Brooks @Larry David @The Three Stooges @Andy Samberg  @FamousJewishFemaleComedians)

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Rashi: at weddings :) with bridegrooms and brides (obviously shomer negiah, guys)

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Rashi: during the days of mourning for a deceased person

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Rashi: this refers to the future, when we will return to Israel and will be redeemed from our exile.

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Rashi: This refers to Tisha B'Av, the saddest day on the Jewish calendar, which is the symbolic date for the Jewish people's exile.

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I think the pasuk is giving advice on how to be a quality human being. Serious things need to be treated with seriousness; going through a profound and deep experience without any real thinking or personal reflection will likely lessen the experiences's positive impact on you. So too, during lighthearted moments it is important to be easy-going to bring laughter and joy to your environment. You should be someone who can both laugh with your friends and feel their pain and cry with them when things are rough.

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"A time to weep and a time to laugh" has a strong parallel to "a time of wailing and a time of dancing". Both halves of the pasuk speak of the cyclical nature of good times and bad times in our lives as human beings.

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"Wailing refers to mourning of the dead at their funeral". After the period of mourning, one can dance again.

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A time to weep and a time to laugh; a time of wailing
and a time of dancing.
(Kohelet 3:4)