Enable Event Invites

[Watercycle]

This PR removes the feature flags hiding the event invites panel on production.

Type of Pull Request

Based on the [contributor's guide][contrib-guide], this PR is of type:

• [x] Development (feature-branch -> dev)
• [ ] Hotfix (hotfix-branch -> master)
• [ ] Release (release-branch -> master)
• [ ] Other

Requestor Checklist

Requestor: Put an x in all that apply. You can check boxes after the PR has been made.

Reviewer: If you see an item that is not checked that you believe should be, comment on that as part of your review.

• [ ] Code Quality: I have written tests to ensure that my changes work and handle edge cases
• [ ] Code Quality: I have documented my changes thoroughly (using [JSDoc][jsdoc] in Javascript)
• [ ] Process: I have linked relevant issues, [marking issues][gh-marking-issues] that this PR resolves
• [x] Process: I have requested at least as many reviews required for this PR type (2 or 3)
• [x] Process: I have added this PR to the relevant quarterly milestone
• [x] Process: I have tested this PR locally and verified it does what it should

How This Has Been Tested

TODO: deploy and test on https://carpe-test.herokuapp.com