Levina enters her friend Marcellus's house, where she knows there is supposed to be a surprise birthday party for their mutual friend Tycho. Upon entering, she sees that Arvid and Jolene, who are also friends but were not aware of the surprise, are chatting in the living room, and the room is not yet decorated for the party. Marcellus is nowhere to be seen. Tycho is expected to arrive in 30 minutes. It's evident that the surprise has not been set up, and Marcellus had an emergency that he had to attend to, leaving a note that only Levina will notice when she heads to the kitchen to put down the cake she brought. The note explains the emergency and asks Levina to take charge of the decoration and to keep the surprise from Arvid and Jolene until Tycho arrives. How should Levina proceed without arousing suspicions from Arvid and Jolene, ensuring that the room is decorated in time, and maintaining the surprise for Tycho? Provide a brief response.
Levina, upon reading Marcellus's note, realizes that she is now responsible for organizing the surprise without alerting Arvid and Jolene of the situation. She must quickly but calmly take control of the circumstance to prevent arousing Arvid and Jolene's suspicions. Since Tycho's arrival is imminent, Levina's actions need to be both resourceful and discreet to maintain the secrecy of the surprise party. 

First, Levina could engage Arvid and Jolene in a conversation, casually asking for their help with a fictive task that would transition smoothly into party setup, perhaps under the guise of Marcellus wanting to "spruce up the place" for no particular reason. Levina should be careful not to mention the party or Tycho's upcoming birthday as a reason. 

As they help Levina decorate, it will be important for her to diligently steer the conversation away from any topics that might lead to the disclosure of the true purpose of their activities. If Arvid or Jolene begins to suspect the real reason behind the decorations, Levina might downplay their assertions, suggesting that the decorations are actually for another occasion or are simply part of a game or challenge conceived by Marcellus.

If Levina is questioned about Marcellus's whereabouts, she could explain that he had a minor matter to attend to but will be back shortly, without revealing the nature of his emergency. This approach capitalizes on the partial knowledge each person at the party holds, allowing for the surprise to be efficiently set up and for Tycho to arrive without the true motive being uncovered. By orchestrating the setup in this manner, Levina manages to maintain the surprise for Tycho while effectively utilizing the unsuspecting assistance of Arvid and Jolene.