Yes, you may accept tips if offered. However, it is against Incorporate Massage policy to request a tip in any way.
In a spa setting or a private massage practice, it's common for clients to tip their massage therapists. But tipping in a corporate massage setting is unusual.
If someone offers you a tip at an Incorporate Massage event, you may graciously accept it.
However, in no way are you to solicit tips from massage participants or clients.
That includes leaving out a tip jar around the massage area, posting signs that mention tipping, or in any other way indicate that you're expecting a tip.
Clients have complained in the past about Incorporate Massage therapists leaving out tip jars or posting signs. This is because they are paying for the massage service for their employees or customers and don't want any financial burden on those receiving massages.