An invitation that is extended without time limits or restrictive conditions, allowing the invited person to attend, visit, or participate at their convenience.
A standing offer to come or take part whenever the invitee chooses.
2.
globalneutralfigurative
A situation or action that effectively encourages or enables undesirable behaviour by creating an easy opportunity for it.
A circumstance that invites exploitation, trespass, or trouble because it lacks protection or restraint.