Invite along
Definition 1 of 1
Pro Tip 1/3Casual Contexts
Use 'invite along' for casual events or outings, not formal or official events. 
I'm hanging out at the park later, do you want me to invite you along?
Pro Tip 2/3Personal Choice
It implies that attending the event is optional and based on the person's preference. 
They're going bowling this Saturday; feel free to invite them along if they're interested.
Pro Tip 3/3Group Activities
Often used when the event involves a group, thus making it more social. 
We're all meeting up for lunch; do you want to invite Alex along?