UPDATE: 'Alienstock' event moving forward in Rachel

LATEST SEPT. 13: The Storm Area 51 event turned music festival named Alienstock is moving ahead even though there's a legal battle brewing over the naming rights and it's causing some confusion.

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The man behind the viral Storm Area 51 sensation wants his former partner to cancel her planned festival in rural Nevada next weekend, according to an attorney letter.

Thursday, 13 Action News obtained a copy of the cease-and-desist letter addressed to Connie West, owner of the Little A'Le'Inn in Rachel. This document was sent by a law firm representing Matty Roberts and another client Brock Daily.

EXCLUSIVE: Man arrested for trespassing near Area 51 talks to 13 Action News

Roberts is the man who created the Storm Area 51 Facebook event that went viral and inspired a slew of Area 51 themed festivals and events in September. Up until Monday, he was co-organizing a festival called Alien Stock in Rachel with West.

Alien Stock was on schedule to take place Sept. 19 through 22 in Rachel.

However, Roberts suddenly announced that he was splitting from the event earlier this week, citing transparency issues with business partners and safety concerns. He has since announced a new partnership with the Downtown Events Center, joining their "Area 51 Celebration" event on Sept. 19 in Las Vegas.

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West has previously said she is financially invested in the event. She also provided 13 Action News with evidence of signed agreements for over 100 portable toilets, security and first responders.

A lineup of 20 bands and two comedians were also part of the festival plans.

RELATED: What's happening with Alien Stock? False reports, misinformation spread online

13 Action News reached out to West about the cease-and-desist letter and she said she has "no comment" and that she had not received the letter.

Read the full letter below: