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Lily is upset with Ted over a promise he made while Barney vies to play laser tag at the rehearsal dinner on How I Met Your Mother.
Marshall tells three stories in rhyme in order to get his son to go to sleep on How I Met Your Mother.
When Barney's father comes to the wedding, he comes up with a plan that makes Robin nervous on How I Met Your Mother.
The gang looks back at a time when they wondered how the love triangle between Ted, Robin, and Barney would end on How I Met Your Mother.
Ted takes Cassie on a date to the lighthouse while Barney ends up in the middle when Robin and his mother continue to argue on How I Met Your Mother.
Marshall rallies his friends to help remove the test message Daphne sent Lily on How I Met Your Mother.
On How I Met Your Mother, despite having multiple date options for the wedding, Ted still manages to make the wrong choice while Barney and Robin get into an argument with their minister.
Lily offers Barney some advice when Robin has issues with his mother and brother while Ted and Marshall argue over wedding etiquette on How I Met Your Mother.
Barney finds out Ted has lingering feelings for Robin, and deals with it over the best man's poker game on How I Met Your Mother.
Robin and Barney prepare for their relatives to arrive while Lily gets a look at Ted's to-do list on How I Met Your Mother.