A salesman from Tech Star arrives to discuss a new phone system, but the office pranks him with a coordinated 'Aye!' chant.

Michael complains about Valentine's Day decorations and singles out Jim and Pam for their romance. He declares a 'Lonely Hearts Convention' for single employees, excluding couples.

Jim nervously gives blood at a donation drive and bonds with a woman named Lynn. After fainting, he wakes to find she left, but she forgot her glove. He tries to get her name from a waitress but fails.

Phyllis and Bob Vance take Jim and Pam out to lunch. Bob Vance teases Jim about using a child's bowling ball, and the conversation turns to relationship stories.

At the singles party, employees share their worst relationship stories, including Oscar's gay bar revelation and Angela's duels. Michael decides to host a mixer to find love for everyone.

Michael greets a woman named Lynn at the mixer and introduces her to Kevin. Kevin awkwardly tries to impress her by claiming he can untie any knot.

At the mixer, employees engage in awkward conversations. Michael tries to set up Meredith with a man in tool and die repair, while others discuss food and movies.

Michael admits he keeps looking at the door for the woman he met while giving blood. Dwight dismisses the odds, but the office romanticizes the encounter. Jim reveals their blood bags touched.

The mixer winds down as attendees leave without making romantic connections. Michael tries to keep the party going, but most people head out.

Kevin gets a woman's email address, giving him hope. Michael gives a heartfelt speech about moving on from Holly, and the employees decide to stay longer at the mixer.

Michael gives a final speech about moving on from Holly and compares love to Cinderella. A woman asks for a cookie, and Michael notices she has a cotton ball, hinting she might be the blood donor.