US 01.08.01 As an entrant, I want to be warned before joining a waiting list that requires geolocation.

[gjy926gg]

Risk: medium: Difficulty: 3 after

[bauga27]

for events that require geolocation, the entrant is warned/notified before joining the waiting list.

Acceptance Criteria

• warning message is shown after first join click
• let entrant entrant reconfirm their decision