Disclosure of h1 challenges name through the calendar

**Summary:** It seems like the Calendar somehow grabs the name of the target for a h1 challenge even though the target name is not public. **Description:** `h1challenges` do not disclose the name of the target until the time it starts. For example for this challenge: █████ the name of the target is not disclosed anywhere and the page looks something like this: █████ However, once we import the calendar on something like Google calendar, it shows the name of the target: █████████ This is super useful specially because sometimes program run multiple challenges in short period of time. For example, knowing more about this challenge (the name of the target), a hacker can hack and hodl bugs until the program starts. ### Steps To Reproduce 1. Add yourself to challenge like the one linked above. 2. Link/update your Google Calendar with the hackerone events calendar. 3. Find the date in the calendar when the challenge is set to start and you can see the name there. ## Impact Disclosure of h1c-* challenge targets.